391052906 has 4 divisors (see below), whose sum is σ = 586579362. Its totient is φ = 195526452.

The previous prime is 391052899. The next prime is 391052983. The reversal of 391052906 is 609250193.

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

It can be written as a sum of positive squares in only one way, i.e., 388444681 + 2608225 = 19709^2 + 1615^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97763225 + ... + 97763228.

Almost surely, 2^391052906 is an apocalyptic number.

391052906 is a deficient number, since it is larger than the sum of its proper divisors (195526456).

391052906 is a wasteful number, since it uses less digits than its factorization.

391052906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 195526455.

The product of its (nonzero) digits is 14580, while the sum is 35.

The square root of 391052906 is about 19775.0576737465. The cubic root of 391052906 is about 731.2712608229.

The spelling of 391052906 in words is "three hundred ninety-one million, fifty-two thousand, nine hundred six".