391423393 has 4 divisors (see below), whose sum is σ = 392545300. Its totient is φ = 390301488.

The previous prime is 391423387. The next prime is 391423423. The reversal of 391423393 is 393324193.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 393324193 = 41 ⋅9593273.

It can be written as a sum of positive squares in 2 ways, for example, as 218684944 + 172738449 = 14788^2 + 13143^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-391423393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (391423303) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 560430 + ... + 561127.

It is an arithmetic number, because the mean of its divisors is an integer number (98136325).

Almost surely, 2^391423393 is an apocalyptic number.

It is an amenable number.

391423393 is a deficient number, since it is larger than the sum of its proper divisors (1121907).

391423393 is a wasteful number, since it uses less digits than its factorization.

391423393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1121906.

The product of its digits is 52488, while the sum is 37.

The square root of 391423393 is about 19784.4229888061. The cubic root of 391423393 is about 731.5021255619.

The spelling of 391423393 in words is "three hundred ninety-one million, four hundred twenty-three thousand, three hundred ninety-three".