391042323 has 40 divisors (see below), whose sum is σ = 669546240. Its totient is φ = 222801840.

The previous prime is 391042273. The next prime is 391042349. The reversal of 391042323 is 323240193.

It is a happy number.

It is not a de Polignac number, because 391042323 - 2⁶ = 391042259 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (391042373) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 248128 + ... + 249698.

It is an arithmetic number, because the mean of its divisors is an integer number (16738656).

Almost surely, 2^391042323 is an apocalyptic number.

391042323 is a deficient number, since it is larger than the sum of its proper divisors (278503917).

391042323 is a wasteful number, since it uses less digits than its factorization.

391042323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2029 (or 2020 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 27.

The square root of 391042323 is about 19774.7900873815. The cubic root of 391042323 is about 731.2646640057.

The spelling of 391042323 in words is "three hundred ninety-one million, forty-two thousand, three hundred twenty-three".