15191994 has 16 divisors (see below), whose sum is σ = 30624768. Its totient is φ = 5023872.

The previous prime is 15191993. The next prime is 15192011. The reversal of 15191994 is 49919151.

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 7 ways as a sum of consecutive naturals, for example, 9207 + ... + 10730.

It is an arithmetic number, because the mean of its divisors is an integer number (1914048).

Almost surely, 2^15191994 is an apocalyptic number.

15191994 is an abundant number, since it is smaller than the sum of its proper divisors (15432774).

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

15191994 is a wasteful number, since it uses less digits than its factorization.

15191994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20069.

The product of its digits is 14580, while the sum is 39.

The square root of 15191994 is about 3897.6908548524. The cubic root of 15191994 is about 247.6689673670.

The spelling of 15191994 in words is "fifteen million, one hundred ninety-one thousand, nine hundred ninety-four".