15421140 has 72 divisors (see below), whose sum is σ = 53464320. Its totient is φ = 3524544.

The previous prime is 15421139. The next prime is 15421163. The reversal of 15421140 is 4112451.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4860 + ... + 7379.

It is an arithmetic number, because the mean of its divisors is an integer number (742560).

Almost surely, 2^15421140 is an apocalyptic number.

15421140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

15421140 is an abundant number, since it is smaller than the sum of its proper divisors (38043180).

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

15421140 is a wasteful number, since it uses less digits than its factorization.

15421140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12261 (or 12256 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 18.

The square root of 15421140 is about 3926.9759357551. The cubic root of 15421140 is about 248.9079836127.

Adding to 15421140 its reverse (4112451), we get a palindrome (19533591).

The spelling of 15421140 in words is "fifteen million, four hundred twenty-one thousand, one hundred forty".