3911431978 has 16 divisors (see below), whose sum is σ = 6214299264. Its totient is φ = 1840073920.

The previous prime is 3911431969. The next prime is 3911431999. The reversal of 3911431978 is 8791341193.

It is an unprimeable number.

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, 97551 + ... + 131677.

It is an arithmetic number, because the mean of its divisors is an integer number (388393704).

Almost surely, 2^3911431978 is an apocalyptic number.

3911431978 is a deficient number, since it is larger than the sum of its proper divisors (2302867286).

3911431978 is a wasteful number, since it uses less digits than its factorization.

3911431978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37517.

The product of its digits is 163296, while the sum is 46.

The square root of 3911431978 is about 62541.4420844291. The cubic root of 3911431978 is about 1575.5974188481.

The spelling of 3911431978 in words is "three billion, nine hundred eleven million, four hundred thirty-one thousand, nine hundred seventy-eight".