15181972394 has 16 divisors (see below), whose sum is σ = 23363907840. Its totient is φ = 7396280640.

The previous prime is 15181972391. The next prime is 15181972441. The reversal of 15181972394 is 49327918151.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (15181972391) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 555962 + ... + 582629.

It is an arithmetic number, because the mean of its divisors is an integer number (1460244240).

Almost surely, 2^15181972394 is an apocalyptic number.

15181972394 is a deficient number, since it is larger than the sum of its proper divisors (8181935446).

15181972394 is a wasteful number, since it uses less digits than its factorization.

15181972394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1138765.

The product of its digits is 544320, while the sum is 50.

The spelling of 15181972394 in words is "fifteen billion, one hundred eighty-one million, nine hundred seventy-two thousand, three hundred ninety-four".