398731305 has 16 divisors (see below), whose sum is σ = 729108864. Its totient is φ = 182277120.

The previous prime is 398731297. The next prime is 398731337. The reversal of 398731305 is 503137893.

It is not a de Polignac number, because 398731305 - 2³ = 398731297 is a prime.

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, 1898616 + ... + 1898825.

It is an arithmetic number, because the mean of its divisors is an integer number (45569304).

Almost surely, 2^398731305 is an apocalyptic number.

398731305 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

It is an amenable number.

398731305 is a deficient number, since it is larger than the sum of its proper divisors (330377559).

398731305 is a wasteful number, since it uses less digits than its factorization.

398731305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3797456.

The product of its (nonzero) digits is 68040, while the sum is 39.

The square root of 398731305 is about 19968.2574352396. The cubic root of 398731305 is about 736.0264893044.

The spelling of 398731305 in words is "three hundred ninety-eight million, seven hundred thirty-one thousand, three hundred five".