1407990391 has 4 divisors (see below), whose sum is σ = 1415285872. Its totient is φ = 1400694912.

The previous prime is 1407990361. The next prime is 1407990403. The reversal of 1407990391 is 1930997041.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1930997041 = 379 ⋅5094979.

It is a cyclic number.

It is not a de Polignac number, because 1407990391 - 2⁵ = 1407990359 is a prime.

It is a super-2 number, since 2×1407990391² = 3964873882296665762, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1407990301) 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, 3647451 + ... + 3647836.

It is an arithmetic number, because the mean of its divisors is an integer number (353821468).

Almost surely, 2^1407990391 is an apocalyptic number.

1407990391 is a deficient number, since it is larger than the sum of its proper divisors (7295481).

1407990391 is an equidigital number, since it uses as much as digits as its factorization.

1407990391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7295480.

The product of its (nonzero) digits is 61236, while the sum is 43.

The square root of 1407990391 is about 37523.1980380138. The cubic root of 1407990391 is about 1120.8131825598.

The spelling of 1407990391 in words is "one billion, four hundred seven million, nine hundred ninety thousand, three hundred ninety-one".