1399289408 has 112 divisors (see below), whose sum is σ = 3163872768. Its totient is φ = 608256000.

The previous prime is 1399289407. The next prime is 1399289413. The reversal of 1399289408 is 8049829931.

It is a self number, because there is not a number n which added to its sum of digits gives 1399289408.

It is not an unprimeable number, because it can be changed into a prime (1399289401) 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, 2116598 + ... + 2117258.

It is an arithmetic number, because the mean of its divisors is an integer number (28248864).

Almost surely, 2^1399289408 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 1399289408, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1581936384).

1399289408 is an abundant number, since it is smaller than the sum of its proper divisors (1764583360).

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

1399289408 is a wasteful number, since it uses less digits than its factorization.

1399289408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 812 (or 802 counting only the distinct ones).

The product of its (nonzero) digits is 1119744, while the sum is 53.

The square root of 1399289408 is about 37407.0769774918. The cubic root of 1399289408 is about 1118.4996406662.

The spelling of 1399289408 in words is "one billion, three hundred ninety-nine million, two hundred eighty-nine thousand, four hundred eight".