394429680 has 60 divisors (see below), whose sum is σ = 1324628760. Its totient is φ = 105181056.

The previous prime is 394429649. The next prime is 394429727. The reversal of 394429680 is 86924493.

It is a tau number, because it is divible by the number of its divisors (60).

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 polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 273190 + ... + 274629.

It is an arithmetic number, because the mean of its divisors is an integer number (22077146).

Almost surely, 2^394429680 is an apocalyptic number.

394429680 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

394429680 is an abundant number, since it is smaller than the sum of its proper divisors (930199080).

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

394429680 is a wasteful number, since it uses less digits than its factorization.

394429680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 547838 (or 547829 counting only the distinct ones).

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

The square root of 394429680 is about 19860.2537748137. The cubic root of 394429680 is about 733.3700936577.

The spelling of 394429680 in words is "three hundred ninety-four million, four hundred twenty-nine thousand, six hundred eighty".