1423731939 has 16 divisors (see below), whose sum is σ = 2170537728. Its totient is φ = 813170592.

The previous prime is 1423731931. The next prime is 1423731961. The reversal of 1423731939 is 9391373241.

It is not a de Polignac number, because 1423731939 - 2³ = 1423731931 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1423731939.

It is not an unprimeable number, because it can be changed into a prime (1423731931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31824 + ... + 62130.

It is an arithmetic number, because the mean of its divisors is an integer number (135658608).

Almost surely, 2^1423731939 is an apocalyptic number.

1423731939 is a deficient number, since it is larger than the sum of its proper divisors (746805789).

1423731939 is a wasteful number, since it uses less digits than its factorization.

1423731939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32554.

The product of its digits is 122472, while the sum is 42.

The square root of 1423731939 is about 37732.3725599120. The cubic root of 1423731939 is about 1124.9746664913.

The spelling of 1423731939 in words is "one billion, four hundred twenty-three million, seven hundred thirty-one thousand, nine hundred thirty-nine".