398977849 has 4 divisors (see below), whose sum is σ = 416324736. Its totient is φ = 381630964.

The previous prime is 398977829. The next prime is 398977861. The reversal of 398977849 is 948779893.

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 a de Polignac number, because none of the positive numbers 2^k-398977849 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (398977829) 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 3 ways as a sum of consecutive naturals, for example, 8673409 + ... + 8673454.

It is an arithmetic number, because the mean of its divisors is an integer number (104081184).

Almost surely, 2^398977849 is an apocalyptic number.

It is an amenable number.

398977849 is a deficient number, since it is larger than the sum of its proper divisors (17346887).

398977849 is a wasteful number, since it uses less digits than its factorization.

398977849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17346886.

The product of its digits is 27433728, while the sum is 64.

The square root of 398977849 is about 19974.4298792231. The cubic root of 398977849 is about 736.1781582976.

The spelling of 398977849 in words is "three hundred ninety-eight million, nine hundred seventy-seven thousand, eight hundred forty-nine".