1398631 has 8 divisors (see below), whose sum is σ = 1515584. Its totient is φ = 1283040.

The previous prime is 1398623. The next prime is 1398659. The reversal of 1398631 is 1368931.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1398631 - 2³ = 1398623 is a prime.

It is a super-2 number, since 2×1398631² = 3912337348322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1398593 and 1398602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1398611) 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 7 ways as a sum of consecutive naturals, for example, 3325 + ... + 3721.

It is an arithmetic number, because the mean of its divisors is an integer number (189448).

2^1398631 is an apocalyptic number.

1398631 is a deficient number, since it is larger than the sum of its proper divisors (116953).

1398631 is a wasteful number, since it uses less digits than its factorization.

1398631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 681.

The product of its digits is 3888, while the sum is 31.

The square root of 1398631 is about 1182.6373070388. The cubic root of 1398631 is about 111.8324183838.

The spelling of 1398631 in words is "one million, three hundred ninety-eight thousand, six hundred thirty-one".