1264022440 has 64 divisors (see below), whose sum is σ = 2906668800. Its totient is φ = 494537472.

The previous prime is 1264022399. The next prime is 1264022467. The reversal of 1264022440 is 442204621.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 887569 + ... + 888991.

It is an arithmetic number, because the mean of its divisors is an integer number (45416700).

Almost surely, 2^1264022440 is an apocalyptic number.

1264022440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1264022440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1453334400).

1264022440 is an abundant number, since it is smaller than the sum of its proper divisors (1642646360).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1264022440 is a wasteful number, since it uses less digits than its factorization.

1264022440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1906 (or 1902 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 25.

The square root of 1264022440 is about 35553.0932550179. The cubic root of 1264022440 is about 1081.2304334949.

The spelling of 1264022440 in words is "one billion, two hundred sixty-four million, twenty-two thousand, four hundred forty".