1399869 has 16 divisors (see below), whose sum is σ = 2094400. Its totient is φ = 924048.

The previous prime is 1399861. The next prime is 1399883. The reversal of 1399869 is 9689931.

It is not a de Polignac number, because 1399869 - 2³ = 1399861 is a prime.

It is a super-2 number, since 2×1399869² = 3919266434322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1399861) 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, 3567 + ... + 3939.

It is an arithmetic number, because the mean of its divisors is an integer number (130900).

2^1399869 is an apocalyptic number.

It is an amenable number.

1399869 is a deficient number, since it is larger than the sum of its proper divisors (694531).

1399869 is a wasteful number, since it uses less digits than its factorization.

1399869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 521 (or 515 counting only the distinct ones).

The product of its digits is 104976, while the sum is 45.

The square root of 1399869 is about 1183.1605977212. The cubic root of 1399869 is about 111.8654048552.

The spelling of 1399869 in words is "one million, three hundred ninety-nine thousand, eight hundred sixty-nine".