1421540 has 48 divisors (see below), whose sum is σ = 3274992. Its totient is φ = 516096.

The previous prime is 1421527. The next prime is 1421543. The reversal of 1421540 is 451241.

It can be written as a sum of positive squares in 8 ways, for example, as 676 + 1420864 = 26^2 + 1192^2 .

It is a Harshad number since it is a multiple of its sum of digits (17).

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1421543) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12524 + ... + 12636.

It is an arithmetic number, because the mean of its divisors is an integer number (68229).

2^1421540 is an apocalyptic number.

1421540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1421540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1637496).

1421540 is an abundant number, since it is smaller than the sum of its proper divisors (1853452).

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

1421540 is a wasteful number, since it uses less digits than its factorization.

1421540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 176 (or 174 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 17.

The square root of 1421540 is about 1192.2835233282. The cubic root of 1421540 is about 112.4397043151.

Adding to 1421540 its reverse (451241), we get a palindrome (1872781).

Subtracting from 1421540 its reverse (451241), we obtain a cube (970299 = 99³).

The spelling of 1421540 in words is "one million, four hundred twenty-one thousand, five hundred forty".