398911969 has 4 divisors (see below), whose sum is σ = 398970544. Its totient is φ = 398853396.

The previous prime is 398911963. The next prime is 398911979. The reversal of 398911969 is 969119893.

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 398911969 - 2⁷ = 398911841 is a prime.

It is a super-2 number, since 2×398911969² = 318261518022913922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (398911963) 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 3 ways as a sum of consecutive naturals, for example, 17487 + ... + 33220.

It is an arithmetic number, because the mean of its divisors is an integer number (99742636).

Almost surely, 2^398911969 is an apocalyptic number.

It is an amenable number.

398911969 is a deficient number, since it is larger than the sum of its proper divisors (58575).

398911969 is an equidigital number, since it uses as much as digits as its factorization.

398911969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58574.

The product of its digits is 944784, while the sum is 55.

The square root of 398911969 is about 19972.7807027464. The cubic root of 398911969 is about 736.1376363431.

The spelling of 398911969 in words is "three hundred ninety-eight million, nine hundred eleven thousand, nine hundred sixty-nine".