1399399 has 2 divisors, whose sum is σ = 1399400. Its totient is φ = 1399398.

The previous prime is 1399393. The next prime is 1399403. The reversal of 1399399 is 9939931.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1399399 - 2⁵ = 1399367 is a prime.

It is a super-2 number, since 2×1399399² = 3916635122402, which contains 22 as substring.

It is a nialpdrome in base 11.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1399393) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 699699 + 699700.

It is an arithmetic number, because the mean of its divisors is an integer number (699700).

2^1399399 is an apocalyptic number.

1399399 is a deficient number, since it is larger than the sum of its proper divisors (1).

1399399 is an equidigital number, since it uses as much as digits as its factorization.

1399399 is an evil number, because the sum of its binary digits is even.

The product of its digits is 59049, while the sum is 43.

The square root of 1399399 is about 1182.9619605042. The cubic root of 1399399 is about 111.8528840109.

The spelling of 1399399 in words is "one million, three hundred ninety-nine thousand, three hundred ninety-nine".