1264431 has 16 divisors (see below), whose sum is σ = 2028800. Its totient is φ = 684288.

The previous prime is 1264411. The next prime is 1264447. The reversal of 1264431 is 1344621.

1264431 = 294² + 295² + ... + 307².

It is not a de Polignac number, because 1264431 - 2⁷ = 1264303 is a prime.

It is a super-2 number, since 2×1264431² = 3197571507522, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1264398 and 1264407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1264411) 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, 1186 + ... + 1983.

It is an arithmetic number, because the mean of its divisors is an integer number (126800).

2^1264431 is an apocalyptic number.

1264431 is a deficient number, since it is larger than the sum of its proper divisors (764369).

1264431 is a wasteful number, since it uses less digits than its factorization.

1264431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3198.

The product of its digits is 576, while the sum is 21.

The square root of 1264431 is about 1124.4692081155. The cubic root of 1264431 is about 108.1346913474.

The spelling of 1264431 in words is "one million, two hundred sixty-four thousand, four hundred thirty-one".