394724988 has 270 divisors, whose sum is σ = 1281517776. Its totient is φ = 105579936.

The previous prime is 394724987. The next prime is 394725007. The reversal of 394724988 is 889427493.

394724988 is a `hidden beast` number, since 394 + 7 + 249 + 8 + 8 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (394724987) by changing a digit.

It is a polite number, since it can be written in 89 ways as a sum of consecutive naturals, for example, 8398381 + ... + 8398427.

Almost surely, 2^394724988 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 394724988, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (640758888).

394724988 is an abundant number, since it is smaller than the sum of its proper divisors (886792788).

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

394724988 is a wasteful number, since it uses less digits than its factorization.

394724988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123 (or 82 counting only the distinct ones).

The product of its digits is 3483648, while the sum is 54.

The square root of 394724988 is about 19867.6870319622. The cubic root of 394724988 is about 733.5530717995.

The spelling of 394724988 in words is "three hundred ninety-four million, seven hundred twenty-four thousand, nine hundred eighty-eight".