1399487 has 4 divisors (see below), whose sum is σ = 1405536. Its totient is φ = 1393440.

The previous prime is 1399477. The next prime is 1399493. The reversal of 1399487 is 7849931.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1399487 - 2⁴ = 1399471 is a prime.

It is a Duffinian number.

Its product of digits (54432) is a multiple of the sum of its prime divisors (6048).

It is a plaindrome in base 4 and base 16.

It is a zygodrome in base 4.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1399417) 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, 2663 + ... + 3144.

It is an arithmetic number, because the mean of its divisors is an integer number (351384).

2^1399487 is an apocalyptic number.

1399487 is a deficient number, since it is larger than the sum of its proper divisors (6049).

1399487 is an equidigital number, since it uses as much as digits as its factorization.

1399487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6048.

The product of its digits is 54432, while the sum is 41.

The square root of 1399487 is about 1182.9991546912. Note that the first 3 decimals coincide. The cubic root of 1399487 is about 111.8552285525.

The spelling of 1399487 in words is "one million, three hundred ninety-nine thousand, four hundred eighty-seven".