1399749 has 16 divisors (see below), whose sum is σ = 2116800. Its totient is φ = 815616.

The previous prime is 1399733. The next prime is 1399751. The reversal of 1399749 is 9479931.

It is not a de Polignac number, because 1399749 - 2⁴ = 1399733 is a prime.

It is a Curzon number.

1399749 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 1399749.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1399709) 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, 204 + ... + 1685.

It is an arithmetic number, because the mean of its divisors is an integer number (132300).

2^1399749 is an apocalyptic number.

1399749 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

1399749 is a deficient number, since it is larger than the sum of its proper divisors (717051).

1399749 is a wasteful number, since it uses less digits than its factorization.

1399749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1924.

The product of its digits is 61236, while the sum is 42.

The square root of 1399749 is about 1183.1098850065. The cubic root of 1399749 is about 111.8622083104.

The spelling of 1399749 in words is "one million, three hundred ninety-nine thousand, seven hundred forty-nine".