1398131 has 16 divisors (see below), whose sum is σ = 1751040. Its totient is φ = 1088640.

The previous prime is 1398127. The next prime is 1398139. The reversal of 1398131 is 1318931.

It is not a de Polignac number, because 1398131 - 2² = 1398127 is a prime.

It is a super-2 number, since 2×1398131² = 3909540586322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1398131.

It is not an unprimeable number, because it can be changed into a prime (1398139) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3500 + ... + 3878.

It is an arithmetic number, because the mean of its divisors is an integer number (109440).

2^1398131 is an apocalyptic number.

1398131 is a deficient number, since it is larger than the sum of its proper divisors (352909).

1398131 is a wasteful number, since it uses less digits than its factorization.

1398131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 434.

The product of its digits is 648, while the sum is 26.

The square root of 1398131 is about 1182.4258961982. The cubic root of 1398131 is about 111.8190903809.

The spelling of 1398131 in words is "one million, three hundred ninety-eight thousand, one hundred thirty-one".