15996138 has 16 divisors (see below), whose sum is σ = 33676320. Its totient is φ = 5051376.

The previous prime is 15996131. The next prime is 15996143. The reversal of 15996138 is 83169951.

15996138 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is a super-5 number, since 5×15996138⁵ (a number of 37 digits) contains 55555 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 15996138.

It is not an unprimeable number, because it can be changed into a prime (15996131) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 70045 + ... + 70272.

It is an arithmetic number, because the mean of its divisors is an integer number (2104770).

Almost surely, 2^15996138 is an apocalyptic number.

15996138 is an abundant number, since it is smaller than the sum of its proper divisors (17680182).

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

15996138 is a wasteful number, since it uses less digits than its factorization.

15996138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140341.

The product of its digits is 58320, while the sum is 42.

The square root of 15996138 is about 3999.5172208655. The cubic root of 15996138 is about 251.9639341180.

The spelling of 15996138 in words is "fifteen million, nine hundred ninety-six thousand, one hundred thirty-eight".