398357869 has 8 divisors (see below), whose sum is σ = 490286720. Its totient is φ = 315184176.

The previous prime is 398357863. The next prime is 398357881. The reversal of 398357869 is 968753893.

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 398357869 - 2⁷ = 398357741 is a prime.

It is a super-2 number, since 2×398357869² = 317377983588442322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (398357863) 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, 2188689 + ... + 2188870.

It is an arithmetic number, because the mean of its divisors is an integer number (61285840).

Almost surely, 2^398357869 is an apocalyptic number.

It is an amenable number.

398357869 is a deficient number, since it is larger than the sum of its proper divisors (91928851).

398357869 is a wasteful number, since it uses less digits than its factorization.

398357869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4377579.

The product of its digits is 9797760, while the sum is 58.

The square root of 398357869 is about 19958.9045040052. The cubic root of 398357869 is about 735.7966397486.

The spelling of 398357869 in words is "three hundred ninety-eight million, three hundred fifty-seven thousand, eight hundred sixty-nine".