1398999 has 24 divisors (see below), whose sum is σ = 2247168. Its totient is φ = 771120.

The previous prime is 1398997. The next prime is 1399003. The reversal of 1398999 is 9998931.

It is not a de Polignac number, because 1398999 - 2¹ = 1398997 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1398997) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4404 + ... + 4710.

It is an arithmetic number, because the mean of its divisors is an integer number (93632).

2^1398999 is an apocalyptic number.

1398999 is a deficient number, since it is larger than the sum of its proper divisors (848169).

1398999 is a wasteful number, since it uses less digits than its factorization.

1398999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 355 (or 348 counting only the distinct ones).

The product of its digits is 157464, while the sum is 48.

The square root of 1398999 is about 1182.7928812772. The cubic root of 1398999 is about 111.8422257647.

The spelling of 1398999 in words is "one million, three hundred ninety-eight thousand, nine hundred ninety-nine".