396990187 has 4 divisors (see below), whose sum is σ = 433080216. Its totient is φ = 360900160.

The previous prime is 396990169. The next prime is 396990197. The reversal of 396990187 is 781099693.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-396990187 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (396990127) 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, 18044998 + ... + 18045019.

It is an arithmetic number, because the mean of its divisors is an integer number (108270054).

Almost surely, 2^396990187 is an apocalyptic number.

396990187 is a deficient number, since it is larger than the sum of its proper divisors (36090029).

396990187 is a wasteful number, since it uses less digits than its factorization.

396990187 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36090028.

The product of its (nonzero) digits is 734832, while the sum is 52.

The square root of 396990187 is about 19924.6125934734. The cubic root of 396990187 is about 734.9536040561.

The spelling of 396990187 in words is "three hundred ninety-six million, nine hundred ninety thousand, one hundred eighty-seven".