1395640621 has 8 divisors (see below), whose sum is σ = 1456902720. Its totient is φ = 1334427072.

The previous prime is 1395640613. The next prime is 1395640639. The reversal of 1395640621 is 1260465931.

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

It is a cyclic number.

It is not a de Polignac number, because 1395640621 - 2³ = 1395640613 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1395640021) 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 7 ways as a sum of consecutive naturals, for example, 54450 + ... + 75868.

It is an arithmetic number, because the mean of its divisors is an integer number (182112840).

Almost surely, 2^1395640621 is an apocalyptic number.

It is an amenable number.

1395640621 is a deficient number, since it is larger than the sum of its proper divisors (61262099).

1395640621 is a wasteful number, since it uses less digits than its factorization.

1395640621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24275.

The product of its (nonzero) digits is 38880, while the sum is 37.

The square root of 1395640621 is about 37358.2737957738. The cubic root of 1395640621 is about 1117.5265945321.

The spelling of 1395640621 in words is "one billion, three hundred ninety-five million, six hundred forty thousand, six hundred twenty-one".