1391403913 has 4 divisors (see below), whose sum is σ = 1473251220. Its totient is φ = 1309556608.

The previous prime is 1391403899. The next prime is 1391403931. The reversal of 1391403913 is 3193041931.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1056770064 + 334633849 = 32508^2 + 18293^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1391403913 is a prime.

It is a super-2 number, since 2×1391403913² = 3872009698223423138, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1391403983) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40923628 + ... + 40923661.

It is an arithmetic number, because the mean of its divisors is an integer number (368312805).

Almost surely, 2^1391403913 is an apocalyptic number.

It is an amenable number.

1391403913 is a deficient number, since it is larger than the sum of its proper divisors (81847307).

1391403913 is an equidigital number, since it uses as much as digits as its factorization.

1391403913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81847306.

The product of its (nonzero) digits is 8748, while the sum is 34.

The square root of 1391403913 is about 37301.5269526597. The cubic root of 1391403913 is about 1116.3946333809.

The spelling of 1391403913 in words is "one billion, three hundred ninety-one million, four hundred three thousand, nine hundred thirteen".