1399644 has 36 divisors (see below), whose sum is σ = 3747744. Its totient is φ = 438912.

The previous prime is 1399639. The next prime is 1399663. The reversal of 1399644 is 4469931.

1399644 is a `hidden beast` number, since 1 + 3 + 9 + 9 + 644 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 1399599 and 1399608.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 532 + ... + 1755.

It is an arithmetic number, because the mean of its divisors is an integer number (104104).

2^1399644 is an apocalyptic number.

It is an amenable number.

1399644 is an abundant number, since it is smaller than the sum of its proper divisors (2348100).

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

1399644 is a wasteful number, since it uses less digits than its factorization.

1399644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2314 (or 2309 counting only the distinct ones).

The product of its digits is 23328, while the sum is 36.

The square root of 1399644 is about 1183.0655095978. The cubic root of 1399644 is about 111.8594111837.

The spelling of 1399644 in words is "one million, three hundred ninety-nine thousand, six hundred forty-four".