240426 has 36 divisors (see below), whose sum is σ = 564642. Its totient is φ = 73872.

The previous prime is 240421. The next prime is 240433. The reversal of 240426 is 624042.

240426 = T₉₅ + T₉₆ + ... + T₁₃₁.

240426 is a `hidden beast` number, since 240 + 426 = 666.

It can be written as a sum of positive squares in only one way, i.e., 159201 + 81225 = 399^2 + 285^2 .

It is a super-2 number, since 2×240426² = 115609322952, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an Ulam number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 240399 and 240408.

It is not an unprimeable number, because it can be changed into a prime (240421) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 6480 + ... + 6516.

2²⁴⁰⁴²⁶ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 240426, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (282321).

240426 is an abundant number, since it is smaller than the sum of its proper divisors (324216).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

240426 is a wasteful number, since it uses less digits than its factorization.

240426 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83 (or 61 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

The square root of 240426 is about 490.3325402214. The cubic root of 240426 is about 62.1813973035.

Subtracting from 240426 its product of nonzero digits (384), we obtain a palindrome (240042).

Adding to 240426 its reverse (624042), we get a palindrome (864468).

It can be divided in two parts, 240 and 426, that added together give a palindrome (666).

The spelling of 240426 in words is "two hundred forty thousand, four hundred twenty-six".