1391036420 has 12 divisors (see below), whose sum is σ = 2921176524. Its totient is φ = 556414560.

The previous prime is 1391036411. The next prime is 1391036443. The reversal of 1391036420 is 246301931.

It can be written as a sum of positive squares in 2 ways, for example, as 184307776 + 1206728644 = 13576^2 + 34738^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34775891 + ... + 34775930.

It is an arithmetic number, because the mean of its divisors is an integer number (243431377).

Almost surely, 2^1391036420 is an apocalyptic number.

1391036420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1391036420 is an abundant number, since it is smaller than the sum of its proper divisors (1530140104).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1391036420 is a wasteful number, since it uses less digits than its factorization.

1391036420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69551830 (or 69551828 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 29.

The square root of 1391036420 is about 37296.6006493889. The cubic root of 1391036420 is about 1116.2963385738.

The spelling of 1391036420 in words is "one billion, three hundred ninety-one million, thirty-six thousand, four hundred twenty".