1328631 has 8 divisors (see below), whose sum is σ = 1780224. Its totient is φ = 881400.

The previous prime is 1328617. The next prime is 1328647. The reversal of 1328631 is 1368231.

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

It is a de Polignac number, because none of the positive numbers 2^k-1328631 is a prime.

It is a super-2 number, since 2×1328631² = 3530520668322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1328611) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 295 + ... + 1656.

It is an arithmetic number, because the mean of its divisors is an integer number (222528).

2^1328631 is an apocalyptic number.

1328631 is a deficient number, since it is larger than the sum of its proper divisors (451593).

1328631 is a wasteful number, since it uses less digits than its factorization.

1328631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2181.

The product of its digits is 864, while the sum is 24.

The square root of 1328631 is about 1152.6625698790. The cubic root of 1328631 is about 109.9346995347.

The spelling of 1328631 in words is "one million, three hundred twenty-eight thousand, six hundred thirty-one".