1915724138 has 8 divisors (see below), whose sum is σ = 2873804832. Its totient is φ = 957789196.

The previous prime is 1915724113. The next prime is 1915724147. The reversal of 1915724138 is 8314275191.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 1915724095 and 1915724104.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6581 + ... + 62247.

It is an arithmetic number, because the mean of its divisors is an integer number (359225604).

Almost surely, 2^1915724138 is an apocalyptic number.

1915724138 is a deficient number, since it is larger than the sum of its proper divisors (958080694).

1915724138 is a wasteful number, since it uses less digits than its factorization.

1915724138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72876.

The product of its digits is 60480, while the sum is 41.

The square root of 1915724138 is about 43768.9860289224. The cubic root of 1915724138 is about 1241.9696709661.

The spelling of 1915724138 in words is "one billion, nine hundred fifteen million, seven hundred twenty-four thousand, one hundred thirty-eight".