1399783 has 20 divisors (see below), whose sum is σ = 1815048. Its totient is φ = 1070160.

The previous prime is 1399777. The next prime is 1399789. The reversal of 1399783 is 3879931.

It is an interprime number because it is at equal distance from previous prime (1399777) and next prime (1399789).

It is not a de Polignac number, because 1399783 - 2⁵ = 1399751 is a prime.

It is a Duffinian number.

1399783 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1399789) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 26385 + ... + 26437.

2^1399783 is an apocalyptic number.

1399783 is a deficient number, since it is larger than the sum of its proper divisors (415265).

1399783 is an frugal number, since it uses more digits than its factorization.

1399783 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92 (or 71 counting only the distinct ones).

The product of its digits is 40824, while the sum is 40.

The square root of 1399783 is about 1183.1242538297. The cubic root of 1399783 is about 111.8631140166.

The spelling of 1399783 in words is "one million, three hundred ninety-nine thousand, seven hundred eighty-three".