393690739 has 12 divisors (see below), whose sum is σ = 428048712. Its totient is φ = 361920000.

The previous prime is 393690707. The next prime is 393690769. The reversal of 393690739 is 937096393.

It is not a de Polignac number, because 393690739 - 2⁵ = 393690707 is a prime.

It is a super-2 number, since 2×393690739² = 309984795948732242, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 393690692 and 393690701.

It is not an unprimeable number, because it can be changed into a prime (393690769) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 37779 + ... + 47059.

It is an arithmetic number, because the mean of its divisors is an integer number (35670726).

Almost surely, 2^393690739 is an apocalyptic number.

393690739 is a deficient number, since it is larger than the sum of its proper divisors (34357973).

393690739 is a wasteful number, since it uses less digits than its factorization.

393690739 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9558 (or 9545 counting only the distinct ones).

The product of its (nonzero) digits is 826686, while the sum is 49.

The square root of 393690739 is about 19841.6415399533. The cubic root of 393690739 is about 732.9118319976.

The spelling of 393690739 in words is "three hundred ninety-three million, six hundred ninety thousand, seven hundred thirty-nine".