311843640 has 32 divisors (see below), whose sum is σ = 935531280. Its totient is φ = 83158272.

The previous prime is 311843639. The next prime is 311843657. The reversal of 311843640 is 46348113.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 311843598 and 311843607.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1299229 + ... + 1299468.

Almost surely, 2^311843640 is an apocalyptic number.

311843640 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

311843640 is an abundant number, since it is smaller than the sum of its proper divisors (623687640).

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

311843640 is a wasteful number, since it uses less digits than its factorization.

311843640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2598711 (or 2598707 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 30.

The square root of 311843640 is about 17659.0951070546. The cubic root of 311843640 is about 678.1289684266.

The spelling of 311843640 in words is "three hundred eleven million, eight hundred forty-three thousand, six hundred forty".