398573640 has 96 divisors (see below), whose sum is σ = 1363564800. Its totient is φ = 100690560.

The previous prime is 398573639. The next prime is 398573671. The reversal of 398573640 is 46375893.

398573640 is a `hidden beast` number, since 39 + 8 + 573 + 6 + 40 = 666.

It is a super-3 number, since 3×398573640³ (a number of 27 digits) contains 333 as substring.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 22296 + ... + 35975.

It is an arithmetic number, because the mean of its divisors is an integer number (14203800).

Almost surely, 2^398573640 is an apocalyptic number.

398573640 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

398573640 is an abundant number, since it is smaller than the sum of its proper divisors (964991160).

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

398573640 is a wasteful number, since it uses less digits than its factorization.

398573640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58307 (or 58300 counting only the distinct ones).

The product of its (nonzero) digits is 544320, while the sum is 45.

The square root of 398573640 is about 19964.3091540880. The cubic root of 398573640 is about 735.9294641366.

The spelling of 398573640 in words is "three hundred ninety-eight million, five hundred seventy-three thousand, six hundred forty".