261450 has 72 divisors (see below), whose sum is σ = 812448. Its totient is φ = 59040.

The previous prime is 261439. The next prime is 261451. The reversal of 261450 is 54162.

It is a happy number.

261450 is a `hidden beast` number, since 2 + 614 + 50 = 666.

It is a super-2 number, since 2×261450² = 136712205000, 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 not an unprimeable number, because it can be changed into a prime (261451) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 3109 + ... + 3191.

It is an arithmetic number, because the mean of its divisors is an integer number (11284).

2²⁶¹⁴⁵⁰ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 261450, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (406224).

261450 is an abundant number, since it is smaller than the sum of its proper divisors (550998).

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

261450 is a wasteful number, since it uses less digits than its factorization.

261450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108 (or 100 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 261450 is about 511.3218164718. The cubic root of 261450 is about 63.9434722222.

The spelling of 261450 in words is "two hundred sixty-one thousand, four hundred fifty".