391366090 has 8 divisors (see below), whose sum is σ = 704458980. Its totient is φ = 156546432.

The previous prime is 391366043. The next prime is 391366093. The reversal of 391366090 is 90663193.

It can be written as a sum of positive squares in 2 ways, for example, as 386397649 + 4968441 = 19657^2 + 2229^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (391366093) 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, 19568295 + ... + 19568314.

Almost surely, 2^391366090 is an apocalyptic number.

391366090 is a deficient number, since it is larger than the sum of its proper divisors (313092890).

391366090 is a wasteful number, since it uses less digits than its factorization.

391366090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39136616.

The product of its (nonzero) digits is 26244, while the sum is 37.

The square root of 391366090 is about 19782.9747510328. The cubic root of 391366090 is about 731.4664273787.

The spelling of 391366090 in words is "three hundred ninety-one million, three hundred sixty-six thousand, ninety".