1391841888 has 96 divisors (see below), whose sum is σ = 3760073856. Its totient is φ = 450551808.

The previous prime is 1391841881. The next prime is 1391841907. The reversal of 1391841888 is 8881481931.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (96).

It is a self number, because there is not a number n which added to its sum of digits gives 1391841888.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1391841881) 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, 795831 + ... + 797577.

It is an arithmetic number, because the mean of its divisors is an integer number (39167436).

Almost surely, 2^1391841888 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 1391841888, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1880036928).

1391841888 is an abundant number, since it is smaller than the sum of its proper divisors (2368231968).

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

1391841888 is a wasteful number, since it uses less digits than its factorization.

1391841888 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1996 (or 1988 counting only the distinct ones).

The product of its digits is 442368, while the sum is 51.

The square root of 1391841888 is about 37307.3972289679. The cubic root of 1391841888 is about 1116.5117576851.

The spelling of 1391841888 in words is "one billion, three hundred ninety-one million, eight hundred forty-one thousand, eight hundred eighty-eight".