11978631 has 32 divisors (see below), whose sum is σ = 20633600. Its totient is φ = 6726240.

The previous prime is 11978621. The next prime is 11978641. The reversal of 11978631 is 13687911.

11978631 is a `hidden beast` number, since 1 + 19 + 7 + 8 + 631 = 666.

11978631 is nontrivially palindromic in base 13.

It is an interprime number because it is at equal distance from previous prime (11978621) and next prime (11978641).

It is not a de Polignac number, because 11978631 - 2⁶ = 11978567 is a prime.

It is a super-2 number, since 2×11978631² = 286975201268322, which contains 22 as substring.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11978611) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11010 + ... + 12048.

It is an arithmetic number, because the mean of its divisors is an integer number (644800).

Almost surely, 2^11978631 is an apocalyptic number.

11978631 is a deficient number, since it is larger than the sum of its proper divisors (8654969).

11978631 is a wasteful number, since it uses less digits than its factorization.

11978631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1116 (or 1110 counting only the distinct ones).

The product of its digits is 9072, while the sum is 36.

The square root of 11978631 is about 3461.0158913244. The cubic root of 11978631 is about 228.8068711056.

The spelling of 11978631 in words is "eleven million, nine hundred seventy-eight thousand, six hundred thirty-one".