399101961 has 8 divisors (see below), whose sum is σ = 536020704. Its totient is φ = 264125600.

The previous prime is 399101959. The next prime is 399101981. The reversal of 399101961 is 169101993.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 399101961 - 2¹ = 399101959 is a prime.

It is not an unprimeable number, because it can be changed into a prime (399101921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 485115 + ... + 485936.

It is an arithmetic number, because the mean of its divisors is an integer number (67002588).

Almost surely, 2^399101961 is an apocalyptic number.

It is an amenable number.

399101961 is a deficient number, since it is larger than the sum of its proper divisors (136918743).

399101961 is a wasteful number, since it uses less digits than its factorization.

399101961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 971191.

The product of its (nonzero) digits is 13122, while the sum is 39.

The square root of 399101961 is about 19977.5364096777. The cubic root of 399101961 is about 736.2544859027.

The spelling of 399101961 in words is "three hundred ninety-nine million, one hundred one thousand, nine hundred sixty-one".