398861815 has 16 divisors (see below), whose sum is σ = 525361536. Its totient is φ = 288295200.

The previous prime is 398861789. The next prime is 398861821. The reversal of 398861815 is 518168893.

It is not a de Polignac number, because 398861815 - 2⁹ = 398861303 is a prime.

It is a Duffinian number.

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, 13281 + ... + 31210.

It is an arithmetic number, because the mean of its divisors is an integer number (32835096).

Almost surely, 2^398861815 is an apocalyptic number.

398861815 is a deficient number, since it is larger than the sum of its proper divisors (126499721).

398861815 is a wasteful number, since it uses less digits than its factorization.

398861815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44670.

The product of its digits is 414720, while the sum is 49.

The square root of 398861815 is about 19971.5251045082. The cubic root of 398861815 is about 736.1067842611.

The spelling of 398861815 in words is "three hundred ninety-eight million, eight hundred sixty-one thousand, eight hundred fifteen".