393408237 has 16 divisors (see below), whose sum is σ = 555975360. Its totient is φ = 246588672.

The previous prime is 393408221. The next prime is 393408251. The reversal of 393408237 is 732804393.

It is not a de Polignac number, because 393408237 - 2⁴ = 393408221 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 393408195 and 393408204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (393408217) 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, 53839 + ... + 60707.

It is an arithmetic number, because the mean of its divisors is an integer number (34748460).

Almost surely, 2^393408237 is an apocalyptic number.

It is an amenable number.

393408237 is a deficient number, since it is larger than the sum of its proper divisors (162567123).

393408237 is a wasteful number, since it uses less digits than its factorization.

393408237 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8012.

The product of its (nonzero) digits is 108864, while the sum is 39.

The square root of 393408237 is about 19834.5213453716. The cubic root of 393408237 is about 732.7364840389.

The spelling of 393408237 in words is "three hundred ninety-three million, four hundred eight thousand, two hundred thirty-seven".