15222640 has 20 divisors (see below), whose sum is σ = 35392824. Its totient is φ = 6089024.

The previous prime is 15222631. The next prime is 15222659. The reversal of 15222640 is 4622251.

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 95062 + ... + 95221.

Almost surely, 2^15222640 is an apocalyptic number.

15222640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

15222640 is an abundant number, since it is smaller than the sum of its proper divisors (20170184).

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

15222640 is a wasteful number, since it uses less digits than its factorization.

15222640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 190296 (or 190290 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 15222640 is about 3901.6201762857. The cubic root of 15222640 is about 247.8353919809.

Adding to 15222640 its reverse (4622251), we get a palindrome (19844891).

The spelling of 15222640 in words is "fifteen million, two hundred twenty-two thousand, six hundred forty".