398740 has 12 divisors (see below), whose sum is σ = 837396. Its totient is φ = 159488.

The previous prime is 398731. The next prime is 398759. The reversal of 398740 is 47893.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 104976 + 293764 = 324^2 + 542^2 .

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 398740.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9949 + ... + 9988.

It is an arithmetic number, because the mean of its divisors is an integer number (69783).

2³⁹⁸⁷⁴⁰ is an apocalyptic number.

It is an amenable number.

398740 is an abundant number, since it is smaller than the sum of its proper divisors (438656).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

398740 is a wasteful number, since it uses less digits than its factorization.

398740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19946 (or 19944 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 31.

The square root of 398740 is about 631.4586288903. The cubic root of 398740 is about 73.6031839360.

The spelling of 398740 in words is "three hundred ninety-eight thousand, seven hundred forty".