399603649 has 8 divisors (see below), whose sum is σ = 445379040. Its totient is φ = 356302656.

The previous prime is 399603647. The next prime is 399603653. The reversal of 399603649 is 946306993.

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 399603649 - 2¹ = 399603647 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (399603647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 618259 + ... + 618904.

It is an arithmetic number, because the mean of its divisors is an integer number (55672380).

Almost surely, 2^399603649 is an apocalyptic number.

It is an amenable number.

399603649 is a deficient number, since it is larger than the sum of its proper divisors (45775391).

399603649 is a wasteful number, since it uses less digits than its factorization.

399603649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1237199.

The product of its (nonzero) digits is 944784, while the sum is 49.

The square root of 399603649 is about 19990.0887691876. The cubic root of 399603649 is about 736.5628577085.

The spelling of 399603649 in words is "three hundred ninety-nine million, six hundred three thousand, six hundred forty-nine".