1391238240 has 192 divisors, whose sum is σ = 5131123200. Its totient is φ = 310210560.

The previous prime is 1391238239. The next prime is 1391238241. The reversal of 1391238240 is 428321931.

It is an interprime number because it is at equal distance from previous prime (1391238239) and next prime (1391238241).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1391238241) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 132711 + ... + 142809.

It is an arithmetic number, because the mean of its divisors is an integer number (26724600).

Almost surely, 2^1391238240 is an apocalyptic number.

1391238240 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 1391238240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2565561600).

1391238240 is an abundant number, since it is smaller than the sum of its proper divisors (3739884960).

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

1391238240 is a wasteful number, since it uses less digits than its factorization.

1391238240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10165 (or 10157 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 33.

The square root of 1391238240 is about 37299.3061597666. The cubic root of 1391238240 is about 1116.3503223107.

The spelling of 1391238240 in words is "one billion, three hundred ninety-one million, two hundred thirty-eight thousand, two hundred forty".