1399872 has 56 divisors (see below), whose sum is σ = 3877056. Its totient is φ = 444928.

The previous prime is 1399861. The next prime is 1399883. The reversal of 1399872 is 2789931.

It is an interprime number because it is at equal distance from previous prime (1399861) and next prime (1399883).

It is a self number, because there is not a number n which added to its sum of digits gives 1399872.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4258 + ... + 4574.

2^1399872 is an apocalyptic number.

1399872 is a gapful number since it is divisible by the number (12) 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 1399872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1938528).

1399872 is an abundant number, since it is smaller than the sum of its proper divisors (2477184).

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

1399872 is a wasteful number, since it uses less digits than its factorization.

1399872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 355 (or 345 counting only the distinct ones).

The product of its digits is 27216, while the sum is 39.

The square root of 1399872 is about 1183.1618655112. The cubic root of 1399872 is about 111.8654847665.

It can be divided in two parts, 139 and 9872, that added together give a triangular number (10011 = T₁₄₁).

The spelling of 1399872 in words is "one million, three hundred ninety-nine thousand, eight hundred seventy-two".