394057690 has 32 divisors (see below), whose sum is σ = 766636416. Its totient is φ = 144970560.

The previous prime is 394057687. The next prime is 394057691. The reversal of 394057690 is 96750493.

It is a super-2 number, since 2×394057690² = 310562926096272200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (394057691) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31435 + ... + 42145.

It is an arithmetic number, because the mean of its divisors is an integer number (23957388).

Almost surely, 2^394057690 is an apocalyptic number.

394057690 is a deficient number, since it is larger than the sum of its proper divisors (372578726).

394057690 is a wasteful number, since it uses less digits than its factorization.

394057690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11014.

The product of its (nonzero) digits is 204120, while the sum is 43.

The square root of 394057690 is about 19850.8863781948. The cubic root of 394057690 is about 733.1394719424.

The spelling of 394057690 in words is "three hundred ninety-four million, fifty-seven thousand, six hundred ninety".