399912945 has 8 divisors (see below), whose sum is σ = 639860736. Its totient is φ = 213286896.

The previous prime is 399912941. The next prime is 399912979. The reversal of 399912945 is 549219993.

It is a happy number.

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

It is not a de Polignac number, because 399912945 - 2² = 399912941 is a prime.

It is not an unprimeable number, because it can be changed into a prime (399912941) by changing a digit.

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 in 7 ways as a sum of consecutive naturals, for example, 13330417 + ... + 13330446.

It is an arithmetic number, because the mean of its divisors is an integer number (79982592).

Almost surely, 2^399912945 is an apocalyptic number.

It is an amenable number.

399912945 is a deficient number, since it is larger than the sum of its proper divisors (239947791).

399912945 is a wasteful number, since it uses less digits than its factorization.

399912945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26660871.

The product of its digits is 787320, while the sum is 51.

The square root of 399912945 is about 19997.8235065719. The cubic root of 399912945 is about 736.7528436229.

The spelling of 399912945 in words is "three hundred ninety-nine million, nine hundred twelve thousand, nine hundred forty-five".