15640422 has 32 divisors (see below), whose sum is σ = 35895552. Its totient is φ = 4450464.

The previous prime is 15640409. The next prime is 15640441. The reversal of 15640422 is 22404651.

It is a nialpdrome in base 16.

It is a junction number, because it is equal to n+sod(n) for n = 15640392 and 15640401.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12288 + ... + 13500.

It is an arithmetic number, because the mean of its divisors is an integer number (1121736).

Almost surely, 2^15640422 is an apocalyptic number.

15640422 is an abundant number, since it is smaller than the sum of its proper divisors (20255130).

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

15640422 is a wasteful number, since it uses less digits than its factorization.

15640422 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1532.

The product of its (nonzero) digits is 1920, while the sum is 24.

The square root of 15640422 is about 3954.7973399404. The cubic root of 15640422 is about 250.0822236208.

The spelling of 15640422 in words is "fifteen million, six hundred forty thousand, four hundred twenty-two".