383999939 has 2 divisors, whose sum is σ = 383999940. Its totient is φ = 383999938.

The previous prime is 383999911. The next prime is 383999951. The reversal of 383999939 is 939999383.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 383999939 - 2²⁰ = 382951363 is a prime.

It is not a weakly prime, because it can be changed into another prime (383999339) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 191999969 + 191999970.

It is an arithmetic number, because the mean of its divisors is an integer number (191999970).

Almost surely, 2^383999939 is an apocalyptic number.

383999939 is a deficient number, since it is larger than the sum of its proper divisors (1).

383999939 is an equidigital number, since it uses as much as digits as its factorization.

383999939 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12754584, while the sum is 62.

The square root of 383999939 is about 19595.9163858188. The cubic root of 383999939 is about 726.8481986452.

The spelling of 383999939 in words is "three hundred eighty-three million, nine hundred ninety-nine thousand, nine hundred thirty-nine".