1938612065 has 16 divisors (see below), whose sum is σ = 2519294400. Its totient is φ = 1423584192.

The previous prime is 1938612059. The next prime is 1938612073. The reversal of 1938612065 is 5602168391.

It is a cyclic number.

It is not a de Polignac number, because 1938612065 - 2¹⁸ = 1938349921 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 71675 + ... + 94944.

It is an arithmetic number, because the mean of its divisors is an integer number (157455900).

Almost surely, 2^1938612065 is an apocalyptic number.

It is an amenable number.

1938612065 is a deficient number, since it is larger than the sum of its proper divisors (580682335).

1938612065 is a wasteful number, since it uses less digits than its factorization.

1938612065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166816.

The product of its (nonzero) digits is 77760, while the sum is 41.

The square root of 1938612065 is about 44029.6725515873. The cubic root of 1938612065 is about 1246.8962067528.

The spelling of 1938612065 in words is "one billion, nine hundred thirty-eight million, six hundred twelve thousand, sixty-five".