311887394 has 96 divisors (see below), whose sum is σ = 626766336. Its totient is φ = 113270400.

The previous prime is 311887361. The next prime is 311887427. The reversal of 311887394 is 493788113.

It is an interprime number because it is at equal distance from previous prime (311887361) and next prime (311887427).

It is a super-2 number, since 2×311887394² = 194547493072222472, which contains 22 as substring.

Its product of digits (145152) is a multiple of the sum of its prime divisors (189).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3087944 + ... + 3088044.

It is an arithmetic number, because the mean of its divisors is an integer number (6528816).

Almost surely, 2^311887394 is an apocalyptic number.

311887394 is an abundant number, since it is smaller than the sum of its proper divisors (314878942).

311887394 is a wasteful number, since it uses less digits than its factorization.

311887394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 208 (or 189 counting only the distinct ones).

The product of its digits is 145152, while the sum is 44.

The square root of 311887394 is about 17660.3339153030. Note that the first 3 decimals coincide. The cubic root of 311887394 is about 678.1606824690.

The spelling of 311887394 in words is "three hundred eleven million, eight hundred eighty-seven thousand, three hundred ninety-four".