1391271888 has 20 divisors (see below), whose sum is σ = 3594119168. Its totient is φ = 463757280.

The previous prime is 1391271883. The next prime is 1391271913. The reversal of 1391271888 is 8881721931.

It is a happy number.

It is a hoax number, since the sum of its digits (48) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (48), and also a Moran number because the ratio is a prime number: 28984831 = 1391271888 / (1 + 3 + 9 + 1 + 2 + 7 + 1 + 8 + 8 + 8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1391271883) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14492368 + ... + 14492463.

Almost surely, 2^1391271888 is an apocalyptic number.

It is an amenable number.

1391271888 is an abundant number, since it is smaller than the sum of its proper divisors (2202847280).

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

1391271888 is a wasteful number, since it uses less digits than its factorization.

1391271888 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28984842 (or 28984836 counting only the distinct ones).

The product of its digits is 193536, while the sum is 48.

The square root of 1391271888 is about 37299.7572110061. The cubic root of 1391271888 is about 1116.3593221239.

The spelling of 1391271888 in words is "one billion, three hundred ninety-one million, two hundred seventy-one thousand, eight hundred eighty-eight".