15990940 has 24 divisors (see below), whose sum is σ = 38378592. Its totient is φ = 5482560.

The previous prime is 15990917. The next prime is 15990973. The reversal of 15990940 is 4909951.

It is a self number, because there is not a number n which added to its sum of digits gives 15990940.

It is a congruent number.

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, 56971 + ... + 57250.

It is an arithmetic number, because the mean of its divisors is an integer number (1599108).

Almost surely, 2^15990940 is an apocalyptic number.

15990940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

15990940 is an abundant number, since it is smaller than the sum of its proper divisors (22387652).

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

15990940 is a wasteful number, since it uses less digits than its factorization.

15990940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114237 (or 114235 counting only the distinct ones).

The product of its (nonzero) digits is 14580, while the sum is 37.

The square root of 15990940 is about 3998.8673396351. The cubic root of 15990940 is about 251.9366389792.

The spelling of 15990940 in words is "fifteen million, nine hundred ninety thousand, nine hundred forty".