1929397139 has 4 divisors (see below), whose sum is σ = 1929780480. Its totient is φ = 1929013800.

The previous prime is 1929397117. The next prime is 1929397163. The reversal of 1929397139 is 9317939291.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1929397139 - 2²⁴ = 1912619923 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1929697139) 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, 184019 + ... + 194220.

It is an arithmetic number, because the mean of its divisors is an integer number (482445120).

Almost surely, 2^1929397139 is an apocalyptic number.

1929397139 is a deficient number, since it is larger than the sum of its proper divisors (383341).

1929397139 is an equidigital number, since it uses as much as digits as its factorization.

1929397139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 383340.

The product of its digits is 826686, while the sum is 53.

The square root of 1929397139 is about 43924.9034034225. The cubic root of 1929397139 is about 1244.9174182199.

The spelling of 1929397139 in words is "one billion, nine hundred twenty-nine million, three hundred ninety-seven thousand, one hundred thirty-nine".