399242993 has 8 divisors (see below), whose sum is σ = 419258688. Its totient is φ = 379448784.

The previous prime is 399242989. The next prime is 399243007.

399242993 is nontrivially palindromic in base 10.

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 399242993 - 2² = 399242989 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (399242923) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 51671 + ... + 58892.

It is an arithmetic number, because the mean of its divisors is an integer number (52407336).

Almost surely, 2^399242993 is an apocalyptic number.

It is an amenable number.

399242993 is a deficient number, since it is larger than the sum of its proper divisors (20015695).

399242993 is a wasteful number, since it uses less digits than its factorization.

399242993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110743.

The product of its digits is 944784, while the sum is 50.

The square root of 399242993 is about 19981.0658624609. The cubic root of 399242993 is about 736.3411999293.

The spelling of 399242993 in words is "three hundred ninety-nine million, two hundred forty-two thousand, nine hundred ninety-three".