1399920 has 80 divisors (see below), whose sum is σ = 4583040. Its totient is φ = 352512.

The previous prime is 1399919. The next prime is 1399943. The reversal of 1399920 is 299931.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4407 + ... + 4713.

It is an arithmetic number, because the mean of its divisors is an integer number (57288).

2^1399920 is an apocalyptic number.

1399920 is a gapful number since it is divisible by the number (10) 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 1399920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2291520).

1399920 is an abundant number, since it is smaller than the sum of its proper divisors (3183120).

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

1399920 is a wasteful number, since it uses less digits than its factorization.

1399920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 342 (or 336 counting only the distinct ones).

The product of its (nonzero) digits is 4374, while the sum is 33.

The square root of 1399920 is about 1183.1821499668. The cubic root of 1399920 is about 111.8667633315.

The spelling of 1399920 in words is "one million, three hundred ninety-nine thousand, nine hundred twenty".