398857291 has 8 divisors (see below), whose sum is σ = 479828480. Its totient is φ = 323884008.

The previous prime is 398857267. The next prime is 398857297. The reversal of 398857291 is 192758893.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 398857291 - 2⁵ = 398857259 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (398857297) 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, 1499331 + ... + 1499596.

It is an arithmetic number, because the mean of its divisors is an integer number (59978560).

Almost surely, 2^398857291 is an apocalyptic number.

398857291 is the 11531-st hex number.

398857291 is a deficient number, since it is larger than the sum of its proper divisors (80971189).

398857291 is a wasteful number, since it uses less digits than its factorization.

398857291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2998953.

The product of its digits is 1088640, while the sum is 52.

The square root of 398857291 is about 19971.4118429319. The cubic root of 398857291 is about 736.1040012089.

The spelling of 398857291 in words is "three hundred ninety-eight million, eight hundred fifty-seven thousand, two hundred ninety-one".