1391367040 has 128 divisors (see below), whose sum is σ = 4025246400. Its totient is φ = 448954368.

The previous prime is 1391367007. The next prime is 1391367041. The reversal of 1391367040 is 407631931.

It is a tau number, because it is divible by the number of its divisors (128).

It is a Harshad number since it is a multiple of its sum of digits (34).

It is a junction number, because it is equal to n+sod(n) for n = 1391366987 and 1391367005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1391367041) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 67026 + ... + 85294.

Almost surely, 2^1391367040 is an apocalyptic number.

1391367040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1391367040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2012623200).

1391367040 is an abundant number, since it is smaller than the sum of its proper divisors (2633879360).

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

1391367040 is a wasteful number, since it uses less digits than its factorization.

1391367040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18312 (or 18300 counting only the distinct ones).

The product of its (nonzero) digits is 13608, while the sum is 34.

The square root of 1391367040 is about 37301.0326934791. The cubic root of 1391367040 is about 1116.3847715949.

Adding to 1391367040 its reverse (407631931), we get a palindrome (1798998971).

The spelling of 1391367040 in words is "one billion, three hundred ninety-one million, three hundred sixty-seven thousand, forty".