398692440 has 48 divisors (see below), whose sum is σ = 1295751600. Its totient is φ = 106317888.

The previous prime is 398692439. The next prime is 398692451. The reversal of 398692440 is 44296893.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 553380 + ... + 554099.

It is an arithmetic number, because the mean of its divisors is an integer number (26994825).

Almost surely, 2^398692440 is an apocalyptic number.

398692440 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

398692440 is an abundant number, since it is smaller than the sum of its proper divisors (897059160).

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

398692440 is a wasteful number, since it uses less digits than its factorization.

398692440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1107496 (or 1107489 counting only the distinct ones).

The product of its (nonzero) digits is 373248, while the sum is 45.

The square root of 398692440 is about 19967.2842419794. The cubic root of 398692440 is about 736.0025746208.

The spelling of 398692440 in words is "three hundred ninety-eight million, six hundred ninety-two thousand, four hundred forty".