1431309 has 12 divisors (see below), whose sum is σ = 2098208. Its totient is φ = 867240.

The previous prime is 1431307. The next prime is 1431317. The reversal of 1431309 is 9031341.

1431309 = 43² + 44² + ... + 163².

It is not a de Polignac number, because 1431309 - 2¹ = 1431307 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1431307) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1609 + ... + 2334.

2^1431309 is an apocalyptic number.

It is an amenable number.

1431309 is a deficient number, since it is larger than the sum of its proper divisors (666899).

1431309 is a wasteful number, since it uses less digits than its factorization.

1431309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3968 (or 3957 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 21.

The square root of 1431309 is about 1196.3732695108. The cubic root of 1431309 is about 112.6966831002.

The spelling of 1431309 in words is "one million, four hundred thirty-one thousand, three hundred nine".