398800691 has 4 divisors (see below), whose sum is σ = 399930792. Its totient is φ = 397670592.

The previous prime is 398800669. The next prime is 398800697. The reversal of 398800691 is 196008893.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 398800691 - 2⁶ = 398800627 is a prime.

It is a super-2 number, since 2×398800691² = 318083982284154962, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (398800697) 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, 564521 + ... + 565226.

It is an arithmetic number, because the mean of its divisors is an integer number (99982698).

Almost surely, 2^398800691 is an apocalyptic number.

398800691 is a deficient number, since it is larger than the sum of its proper divisors (1130101).

398800691 is a wasteful number, since it uses less digits than its factorization.

398800691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1130100.

The product of its (nonzero) digits is 93312, while the sum is 44.

The square root of 398800691 is about 19969.9947671500. The cubic root of 398800691 is about 736.0691805196.

The spelling of 398800691 in words is "three hundred ninety-eight million, eight hundred thousand, six hundred ninety-one".