398131765 has 16 divisors (see below), whose sum is σ = 483816960. Its totient is φ = 314487360.

The previous prime is 398131733. The next prime is 398131777. The reversal of 398131765 is 567131893.

It is not a de Polignac number, because 398131765 - 2⁵ = 398131733 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 179292 + ... + 181498.

It is an arithmetic number, because the mean of its divisors is an integer number (30238560).

Almost surely, 2^398131765 is an apocalyptic number.

It is an amenable number.

398131765 is a deficient number, since it is larger than the sum of its proper divisors (85685195).

398131765 is a wasteful number, since it uses less digits than its factorization.

398131765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2652.

The product of its digits is 136080, while the sum is 43.

The square root of 398131765 is about 19953.2394613005. The cubic root of 398131765 is about 735.6574030954.

The spelling of 398131765 in words is "three hundred ninety-eight million, one hundred thirty-one thousand, seven hundred sixty-five".