1390465621 has 8 divisors (see below), whose sum is σ = 1454281920. Its totient is φ = 1326929472.

The previous prime is 1390465613. The next prime is 1390465627. The reversal of 1390465621 is 1265640931.

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 1390465621 - 2³ = 1390465613 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 (1390465627) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 59851 + ... + 79768.

It is an arithmetic number, because the mean of its divisors is an integer number (181785240).

Almost surely, 2^1390465621 is an apocalyptic number.

It is an amenable number.

1390465621 is a deficient number, since it is larger than the sum of its proper divisors (63816299).

1390465621 is a wasteful number, since it uses less digits than its factorization.

1390465621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140075.

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

The square root of 1390465621 is about 37288.9477057211. The cubic root of 1390465621 is about 1116.1436303728.

The spelling of 1390465621 in words is "one billion, three hundred ninety million, four hundred sixty-five thousand, six hundred twenty-one".