391091436 has 24 divisors (see below), whose sum is σ = 1013941040. Its totient is φ = 130363776.

The previous prime is 391091431. The next prime is 391091447. The reversal of 391091436 is 634190193.

It is a super-2 number, since 2×391091436² = 305905022625084192, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 391091436.

It is not an unprimeable number, because it can be changed into a prime (391091431) 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, 1810501 + ... + 1810716.

Almost surely, 2^391091436 is an apocalyptic number.

391091436 is a gapful number since it is divisible by the number (36) formed by its first and last digit.

It is an amenable number.

391091436 is an abundant number, since it is smaller than the sum of its proper divisors (622849604).

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

391091436 is a wasteful number, since it uses less digits than its factorization.

391091436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3621230 (or 3621222 counting only the distinct ones).

The product of its (nonzero) digits is 17496, while the sum is 36.

The square root of 391091436 is about 19776.0318567705. The cubic root of 391091436 is about 731.2952771439.

The spelling of 391091436 in words is "three hundred ninety-one million, ninety-one thousand, four hundred thirty-six".