15422440 has 32 divisors (see below), whose sum is σ = 37856160. Its totient is φ = 5608000.

The previous prime is 15422413. The next prime is 15422497. The reversal of 15422440 is 4422451.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17086 + ... + 17965.

It is an arithmetic number, because the mean of its divisors is an integer number (1183005).

Almost surely, 2^15422440 is an apocalyptic number.

15422440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

15422440 is an abundant number, since it is smaller than the sum of its proper divisors (22433720).

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

15422440 is a wasteful number, since it uses less digits than its factorization.

15422440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35073 (or 35069 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 22.

The square root of 15422440 is about 3927.1414540350. The cubic root of 15422440 is about 248.9149777192.

Adding to 15422440 its reverse (4422451), we get a palindrome (19844891).

The spelling of 15422440 in words is "fifteen million, four hundred twenty-two thousand, four hundred forty".