15920990 has 8 divisors (see below), whose sum is σ = 28657800. Its totient is φ = 6368392.

The previous prime is 15920981. The next prime is 15920999. The reversal of 15920990 is 9902951.

It is an interprime number because it is at equal distance from previous prime (15920981) and next prime (15920999).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 15920990.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15920999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 796040 + ... + 796059.

It is an arithmetic number, because the mean of its divisors is an integer number (3582225).

Almost surely, 2^15920990 is an apocalyptic number.

15920990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

15920990 is a deficient number, since it is larger than the sum of its proper divisors (12736810).

15920990 is a wasteful number, since it uses less digits than its factorization.

15920990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1592106.

The product of its (nonzero) digits is 7290, while the sum is 35.

The square root of 15920990 is about 3990.1115272634. Note that the first 3 decimals coincide. The cubic root of 15920990 is about 251.5687488514.

The spelling of 15920990 in words is "fifteen million, nine hundred twenty thousand, nine hundred ninety".