1264423643 has 16 divisors (see below), whose sum is σ = 1542959616. Its totient is φ = 1012556160.

The previous prime is 1264423639. The next prime is 1264423649. The reversal of 1264423643 is 3463244621.

It is not a de Polignac number, because 1264423643 - 2² = 1264423639 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1264423649) 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, 84398 + ... + 98243.

It is an arithmetic number, because the mean of its divisors is an integer number (96434976).

Almost surely, 2^1264423643 is an apocalyptic number.

1264423643 is a deficient number, since it is larger than the sum of its proper divisors (278535973).

1264423643 is a wasteful number, since it uses less digits than its factorization.

1264423643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 182714.

The product of its digits is 82944, while the sum is 35.

The square root of 1264423643 is about 35558.7351152990. The cubic root of 1264423643 is about 1081.3448162233.

The spelling of 1264423643 in words is "one billion, two hundred sixty-four million, four hundred twenty-three thousand, six hundred forty-three".