1407990621 has 4 divisors (see below), whose sum is σ = 1877320832. Its totient is φ = 938660412.

The previous prime is 1407990613. The next prime is 1407990641. The reversal of 1407990621 is 1260997041.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 1407990621 - 2³ = 1407990613 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1407990621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1407990641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 234665101 + ... + 234665106.

It is an arithmetic number, because the mean of its divisors is an integer number (469330208).

Almost surely, 2^1407990621 is an apocalyptic number.

It is an amenable number.

1407990621 is a deficient number, since it is larger than the sum of its proper divisors (469330211).

1407990621 is an equidigital number, since it uses as much as digits as its factorization.

1407990621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 469330210.

The product of its (nonzero) digits is 27216, while the sum is 39.

The square root of 1407990621 is about 37523.2011027844. The cubic root of 1407990621 is about 1120.8132435893.

The spelling of 1407990621 in words is "one billion, four hundred seven million, nine hundred ninety thousand, six hundred twenty-one".