15890985 has 96 divisors (see below), whose sum is σ = 33022080. Its totient is φ = 7257600.

The previous prime is 15890983. The next prime is 15890989. The reversal of 15890985 is 58909851.

It is not a de Polignac number, because 15890985 - 2¹ = 15890983 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 15890985.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15890981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 387565 + ... + 387605.

It is an arithmetic number, because the mean of its divisors is an integer number (343980).

Almost surely, 2^15890985 is an apocalyptic number.

15890985 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

15890985 is an abundant number, since it is smaller than the sum of its proper divisors (17131095).

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

15890985 is a wasteful number, since it uses less digits than its factorization.

15890985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101 (or 89 counting only the distinct ones).

The product of its (nonzero) digits is 129600, while the sum is 45.

The square root of 15890985 is about 3986.3498341214. The cubic root of 15890985 is about 251.4106123874.

The spelling of 15890985 in words is "fifteen million, eight hundred ninety thousand, nine hundred eighty-five".