398393157 has 4 divisors (see below), whose sum is σ = 531190880. Its totient is φ = 265595436.

The previous prime is 398393131. The next prime is 398393221. The reversal of 398393157 is 751393893.

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 not a de Polignac number, because 398393157 - 2¹⁹ = 397868869 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (398393057) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66398857 + ... + 66398862.

It is an arithmetic number, because the mean of its divisors is an integer number (132797720).

Almost surely, 2^398393157 is an apocalyptic number.

It is an amenable number.

398393157 is a deficient number, since it is larger than the sum of its proper divisors (132797723).

398393157 is a wasteful number, since it uses less digits than its factorization.

398393157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132797722.

The product of its digits is 612360, while the sum is 48.

The square root of 398393157 is about 19959.7885008835. The cubic root of 398393157 is about 735.8183656281.

The spelling of 398393157 in words is "three hundred ninety-eight million, three hundred ninety-three thousand, one hundred fifty-seven".