15191990 has 32 divisors (see below), whose sum is σ = 30046464. Its totient is φ = 5484640.

The previous prime is 15191987. The next prime is 15191993. The reversal of 15191990 is 9919151.

It is an interprime number because it is at equal distance from previous prime (15191987) and next prime (15191993).

It is a self number, because there is not a number n which added to its sum of digits gives 15191990.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15191993) 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 15 ways as a sum of consecutive naturals, for example, 17957 + ... + 18783.

It is an arithmetic number, because the mean of its divisors is an integer number (938952).

Almost surely, 2^15191990 is an apocalyptic number.

15191990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

15191990 is a deficient number, since it is larger than the sum of its proper divisors (14854474).

15191990 is a wasteful number, since it uses less digits than its factorization.

15191990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1012.

The product of its (nonzero) digits is 3645, while the sum is 35.

The square root of 15191990 is about 3897.6903417280. The cubic root of 15191990 is about 247.6689456302.

The spelling of 15191990 in words is "fifteen million, one hundred ninety-one thousand, nine hundred ninety".