398644 has 6 divisors (see below), whose sum is σ = 697634. Its totient is φ = 199320.

The previous prime is 398627. The next prime is 398669. The reversal of 398644 is 446893.

It can be written as a sum of positive squares in only one way, i.e., 345744 + 52900 = 588^2 + 230^2 .

It is an Ulam number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49827 + ... + 49834.

2³⁹⁸⁶⁴⁴ is an apocalyptic number.

It is an amenable number.

398644 is a deficient number, since it is larger than the sum of its proper divisors (298990).

398644 is a wasteful number, since it uses less digits than its factorization.

398644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99665 (or 99663 counting only the distinct ones).

The product of its digits is 20736, while the sum is 34.

The square root of 398644 is about 631.3826098334. The cubic root of 398644 is about 73.5972766006.

The spelling of 398644 in words is "three hundred ninety-eight thousand, six hundred forty-four".