396140187 has 4 divisors (see below), whose sum is σ = 528186920. Its totient is φ = 264093456.

The previous prime is 396140149. The next prime is 396140221. The reversal of 396140187 is 781041693.

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

It is not a de Polignac number, because 396140187 - 2¹¹ = 396138139 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (396140387) 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, 66023362 + ... + 66023367.

It is an arithmetic number, because the mean of its divisors is an integer number (132046730).

Almost surely, 2^396140187 is an apocalyptic number.

396140187 is a deficient number, since it is larger than the sum of its proper divisors (132046733).

396140187 is a wasteful number, since it uses less digits than its factorization.

396140187 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132046732.

The product of its (nonzero) digits is 36288, while the sum is 39.

The square root of 396140187 is about 19903.2707613598. The cubic root of 396140187 is about 734.4286901974.

The spelling of 396140187 in words is "three hundred ninety-six million, one hundred forty thousand, one hundred eighty-seven".