1399087 has 4 divisors (see below), whose sum is σ = 1401480. Its totient is φ = 1396696.

The previous prime is 1399063. The next prime is 1399109. The reversal of 1399087 is 7809931.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 7809931 = 19 ⋅411049.

It is a cyclic number.

It is not a de Polignac number, because 1399087 - 2¹⁹ = 874799 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1399037) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 333 + ... + 1705.

It is an arithmetic number, because the mean of its divisors is an integer number (350370).

2^1399087 is an apocalyptic number.

1399087 is a deficient number, since it is larger than the sum of its proper divisors (2393).

1399087 is a wasteful number, since it uses less digits than its factorization.

1399087 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2392.

The product of its (nonzero) digits is 13608, while the sum is 37.

The square root of 1399087 is about 1182.8300807808. The cubic root of 1399087 is about 111.8445707532.

The spelling of 1399087 in words is "one million, three hundred ninety-nine thousand, eighty-seven".