398393953 has 4 divisors (see below), whose sum is σ = 400282288. Its totient is φ = 396505620.

The previous prime is 398393903. The next prime is 398393959. The reversal of 398393953 is 359393893.

It is a happy number.

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 398393953 - 2⁹ = 398393441 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 398393953.

It is not an unprimeable number, because it can be changed into a prime (398393959) 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, 943851 + ... + 944272.

It is an arithmetic number, because the mean of its divisors is an integer number (100070572).

Almost surely, 2^398393953 is an apocalyptic number.

It is an amenable number.

398393953 is a deficient number, since it is larger than the sum of its proper divisors (1888335).

398393953 is a wasteful number, since it uses less digits than its factorization.

398393953 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1888334.

The product of its digits is 2361960, while the sum is 52.

The square root of 398393953 is about 19959.8084409646. The cubic root of 398393953 is about 735.8188556892.

The spelling of 398393953 in words is "three hundred ninety-eight million, three hundred ninety-three thousand, nine hundred fifty-three".