1399231 has 2 divisors, whose sum is σ = 1399232. Its totient is φ = 1399230.

The previous prime is 1399213. The next prime is 1399261. The reversal of 1399231 is 1329931.

Together with previous prime (1399213) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1399231 - 2⁵ = 1399199 is a prime.

It is a super-2 number, since 2×1399231² = 3915694782722, which contains 22 as substring.

It is a plaindrome in base 16.

It is a self number, because there is not a number n which added to its sum of digits gives 1399231.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1399201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 699615 + 699616.

It is an arithmetic number, because the mean of its divisors is an integer number (699616).

2^1399231 is an apocalyptic number.

1399231 is a deficient number, since it is larger than the sum of its proper divisors (1).

1399231 is an equidigital number, since it uses as much as digits as its factorization.

1399231 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1458, while the sum is 28.

The square root of 1399231 is about 1182.8909501725. The cubic root of 1399231 is about 111.8484077949.

The spelling of 1399231 in words is "one million, three hundred ninety-nine thousand, two hundred thirty-one".