399394949 has 4 divisors (see below), whose sum is σ = 400016736. Its totient is φ = 398773164.

The previous prime is 399394907. The next prime is 399394967. The reversal of 399394949 is 949493993.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 399394949 - 2¹² = 399390853 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399394349) 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, 309929 + ... + 311214.

It is an arithmetic number, because the mean of its divisors is an integer number (100004184).

Almost surely, 2^399394949 is an apocalyptic number.

It is an amenable number.

399394949 is a deficient number, since it is larger than the sum of its proper divisors (621787).

399394949 is an equidigital number, since it uses as much as digits as its factorization.

399394949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 621786.

The product of its digits is 8503056, while the sum is 59.

The square root of 399394949 is about 19984.8680005648. The cubic root of 399394949 is about 736.4346077642.

The spelling of 399394949 in words is "three hundred ninety-nine million, three hundred ninety-four thousand, nine hundred forty-nine".