1399431 has 8 divisors (see below), whose sum is σ = 2035584. Its totient is φ = 848120.

The previous prime is 1399427. The next prime is 1399439. The reversal of 1399431 is 1349931.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1399431 - 2² = 1399427 is a prime.

It is a super-2 number, since 2×1399431² = 3916814247522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1399439) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21171 + ... + 21236.

It is an arithmetic number, because the mean of its divisors is an integer number (254448).

2^1399431 is an apocalyptic number.

1399431 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1399431 is a deficient number, since it is larger than the sum of its proper divisors (636153).

1399431 is a wasteful number, since it uses less digits than its factorization.

1399431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42421.

The product of its digits is 2916, while the sum is 30.

The square root of 1399431 is about 1182.9754857984. The cubic root of 1399431 is about 111.8537365828.

It can be divided in two parts, 1399 and 431, that added together give a triangular number (1830 = T₆₀).

The spelling of 1399431 in words is "one million, three hundred ninety-nine thousand, four hundred thirty-one".