15642140 has 12 divisors (see below), whose sum is σ = 32848536. Its totient is φ = 6256848.

The previous prime is 15642127. The next prime is 15642163. The reversal of 15642140 is 4124651.

15642140 is nontrivially palindromic in base 11.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 391034 + ... + 391073.

It is an arithmetic number, because the mean of its divisors is an integer number (2737378).

Almost surely, 2^15642140 is an apocalyptic number.

15642140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

15642140 is an abundant number, since it is smaller than the sum of its proper divisors (17206396).

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

15642140 is a wasteful number, since it uses less digits than its factorization.

15642140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 782116 (or 782114 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 15642140 is about 3955.0145385321. The cubic root of 15642140 is about 250.0913799281.

Adding to 15642140 its reverse (4124651), we get a palindrome (19766791).

The spelling of 15642140 in words is "fifteen million, six hundred forty-two thousand, one hundred forty".