396231887 has 4 divisors (see below), whose sum is σ = 396272520. Its totient is φ = 396191256.

The previous prime is 396231883. The next prime is 396231893. The reversal of 396231887 is 788132693.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 396231887 - 2² = 396231883 is a prime.

It is a deceptive number, since it divides R_396231886.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (396231881) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4064 + ... + 28442.

It is an arithmetic number, because the mean of its divisors is an integer number (99068130).

Almost surely, 2^396231887 is an apocalyptic number.

396231887 is the 16253-rd pentagonal number.

396231887 is a deficient number, since it is larger than the sum of its proper divisors (40633).

396231887 is a wasteful number, since it uses less digits than its factorization.

396231887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40632.

The product of its digits is 435456, while the sum is 47.

The square root of 396231887 is about 19905.5742695357. The cubic root of 396231887 is about 734.4853552512.

The spelling of 396231887 in words is "three hundred ninety-six million, two hundred thirty-one thousand, eight hundred eighty-seven".