393640269 has 32 divisors (see below), whose sum is σ = 580608000. Its totient is φ = 235248960.

The previous prime is 393640243. The next prime is 393640279. The reversal of 393640269 is 962046393.

It is not a de Polignac number, because 393640269 - 2⁷ = 393640141 is a prime.

It is a super-2 number, since 2×393640269² = 309905322756784722, which contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 393640269.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (393640279) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1096312 + ... + 1096670.

It is an arithmetic number, because the mean of its divisors is an integer number (18144000).

Almost surely, 2^393640269 is an apocalyptic number.

It is an amenable number.

393640269 is a deficient number, since it is larger than the sum of its proper divisors (186967731).

393640269 is a wasteful number, since it uses less digits than its factorization.

393640269 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 745.

The product of its (nonzero) digits is 209952, while the sum is 42.

The square root of 393640269 is about 19840.3696790156. The cubic root of 393640269 is about 732.8805116089.

The spelling of 393640269 in words is "three hundred ninety-three million, six hundred forty thousand, two hundred sixty-nine".