1391040144 has 120 divisors (see below), whose sum is σ = 4226173952. Its totient is φ = 424569600.

The previous prime is 1391040127. The next prime is 1391040149. The reversal of 1391040144 is 4410401931.

It is not an unprimeable number, because it can be changed into a prime (1391040149) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 234819 + ... + 240669.

Almost surely, 2^1391040144 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1391040144, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2113086976).

1391040144 is an abundant number, since it is smaller than the sum of its proper divisors (2835133808).

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

1391040144 is a wasteful number, since it uses less digits than its factorization.

1391040144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6005 (or 5996 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 1391040144 is about 37296.6505734764. The cubic root of 1391040144 is about 1116.2973347336.

The spelling of 1391040144 in words is "one billion, three hundred ninety-one million, forty thousand, one hundred forty-four".