398812945 has 48 divisors (see below), whose sum is σ = 549572688. Its totient is φ = 276664320.

The previous prime is 398812933. The next prime is 398812991. The reversal of 398812945 is 549218893.

It can be written as a sum of positive squares in 8 ways, for example, as 84566416 + 314246529 = 9196^2 + 17727^2 .

It is not a de Polignac number, because 398812945 - 2⁵ = 398812913 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1257927 + ... + 1258243.

It is an arithmetic number, because the mean of its divisors is an integer number (11449431).

Almost surely, 2^398812945 is an apocalyptic number.

It is an amenable number.

398812945 is a deficient number, since it is larger than the sum of its proper divisors (150759743).

398812945 is a wasteful number, since it uses less digits than its factorization.

398812945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 418 (or 399 counting only the distinct ones).

The product of its digits is 622080, while the sum is 49.

The square root of 398812945 is about 19970.3015750889. The cubic root of 398812945 is about 736.0767195398.

The spelling of 398812945 in words is "three hundred ninety-eight million, eight hundred twelve thousand, nine hundred forty-five".