394540731 has 24 divisors (see below), whose sum is σ = 630324240. Its totient is φ = 236229696.

The previous prime is 394540721. The next prime is 394540739. The reversal of 394540731 is 137045493.

It is not a de Polignac number, because 394540731 - 2⁹ = 394540219 is a prime.

It is a super-2 number, since 2×394540731² = 311324776836028722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (394540739) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 41241 + ... + 49898.

It is an arithmetic number, because the mean of its divisors is an integer number (26263510).

Almost surely, 2^394540731 is an apocalyptic number.

394540731 is a deficient number, since it is larger than the sum of its proper divisors (235783509).

394540731 is a wasteful number, since it uses less digits than its factorization.

394540731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91195 (or 91192 counting only the distinct ones).

The product of its (nonzero) digits is 45360, while the sum is 36.

The square root of 394540731 is about 19863.0493882485. The cubic root of 394540731 is about 733.4389135635.

The spelling of 394540731 in words is "three hundred ninety-four million, five hundred forty thousand, seven hundred thirty-one".