1329431 has 6 divisors (see below), whose sum is σ = 1362960. Its totient is φ = 1296708.

The previous prime is 1329407. The next prime is 1329437. The reversal of 1329431 is 1349231.

It is not a de Polignac number, because 1329431 - 2¹⁰ = 1328407 is a prime.

It is a super-2 number, since 2×1329431² = 3534773567522, 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 = 1329397 and 1329406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1329437) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1490 + ... + 2208.

It is an arithmetic number, because the mean of its divisors is an integer number (227160).

2^1329431 is an apocalyptic number.

1329431 is a deficient number, since it is larger than the sum of its proper divisors (33529).

1329431 is an frugal number, since it uses more digits than its factorization.

1329431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 805 (or 762 counting only the distinct ones).

The product of its digits is 648, while the sum is 23.

The square root of 1329431 is about 1153.0095402901. The cubic root of 1329431 is about 109.9567598644.

The spelling of 1329431 in words is "one million, three hundred twenty-nine thousand, four hundred thirty-one".