1398172 has 12 divisors (see below), whose sum is σ = 2575720. Its totient is φ = 662256.

The previous prime is 1398161. The next prime is 1398197. The reversal of 1398172 is 2718931.

It is a plaindrome in base 16.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 9123 + ... + 9274.

2^1398172 is an apocalyptic number.

It is an amenable number.

1398172 is a deficient number, since it is larger than the sum of its proper divisors (1177548).

1398172 is a wasteful number, since it uses less digits than its factorization.

1398172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18420 (or 18418 counting only the distinct ones).

The product of its digits is 3024, while the sum is 31.

The square root of 1398172 is about 1182.4432333097. The cubic root of 1398172 is about 111.8201833968.

The spelling of 1398172 in words is "one million, three hundred ninety-eight thousand, one hundred seventy-two".