1395618638 has 8 divisors (see below), whose sum is σ = 2216570832. Its totient is φ = 656761696.

The previous prime is 1395618629. The next prime is 1395618659. The reversal of 1395618638 is 8368165931.

It is a happy number.

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

It is a congruent number.

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, 20523770 + ... + 20523837.

It is an arithmetic number, because the mean of its divisors is an integer number (277071354).

Almost surely, 2^1395618638 is an apocalyptic number.

1395618638 is a deficient number, since it is larger than the sum of its proper divisors (820952194).

1395618638 is a wasteful number, since it uses less digits than its factorization.

1395618638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41047626.

The product of its digits is 933120, while the sum is 50.

The square root of 1395618638 is about 37357.9795759888. The cubic root of 1395618638 is about 1117.5207270436.

The spelling of 1395618638 in words is "one billion, three hundred ninety-five million, six hundred eighteen thousand, six hundred thirty-eight".