1391713940 has 24 divisors (see below), whose sum is σ = 2941221192. Its totient is φ = 553138560.

The previous prime is 1391713867. The next prime is 1391713943. The reversal of 1391713940 is 493171931.

It can be written as a sum of positive squares in 4 ways, for example, as 28922884 + 1362791056 = 5378^2 + 36916^2 .

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 1391713894 and 1391713903.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1391713943) 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, 218471 + ... + 224750.

It is an arithmetic number, because the mean of its divisors is an integer number (122550883).

Almost surely, 2^1391713940 is an apocalyptic number.

1391713940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1391713940 is an abundant number, since it is smaller than the sum of its proper divisors (1549507252).

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

1391713940 is a wasteful number, since it uses less digits than its factorization.

1391713940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 443387 (or 443385 counting only the distinct ones).

The product of its (nonzero) digits is 20412, while the sum is 38.

The square root of 1391713940 is about 37305.6824089843. The cubic root of 1391713940 is about 1116.4775440709.

The spelling of 1391713940 in words is "one billion, three hundred ninety-one million, seven hundred thirteen thousand, nine hundred forty".