1398431 has 4 divisors (see below), whose sum is σ = 1412112. Its totient is φ = 1384752.

The previous prime is 1398427. The next prime is 1398451. The reversal of 1398431 is 1348931.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1398431 - 2² = 1398427 is a prime.

It is a super-2 number, since 2×1398431² = 3911218523522, which contains 22 as substring.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a junction number, because it is equal to n+sod(n) for n = 1398394 and 1398403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1398401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6686 + ... + 6891.

It is an arithmetic number, because the mean of its divisors is an integer number (353028).

2^1398431 is an apocalyptic number.

1398431 is a deficient number, since it is larger than the sum of its proper divisors (13681).

1398431 is a wasteful number, since it uses less digits than its factorization.

1398431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13680.

The product of its digits is 2592, while the sum is 29.

The square root of 1398431 is about 1182.5527472379. The cubic root of 1398431 is about 111.8270875639.

The spelling of 1398431 in words is "one million, three hundred ninety-eight thousand, four hundred thirty-one".