1044391764 has 48 divisors (see below), whose sum is σ = 2636889920. Its totient is φ = 319818240.

The previous prime is 1044391763. The next prime is 1044391769. The reversal of 1044391764 is 4671934401.

It is a super-2 number, since 2×1044391764² = 2181508313422063392, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1044391763) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17052 + ... + 48780.

Almost surely, 2^1044391764 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1044391764, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1318444960).

1044391764 is an abundant number, since it is smaller than the sum of its proper divisors (1592498156).

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

1044391764 is a wasteful number, since it uses less digits than its factorization.

1044391764 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31960 (or 31958 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 39.

The square root of 1044391764 is about 32317.0506698863. The cubic root of 1044391764 is about 1014.5835411208.

The spelling of 1044391764 in words is "one billion, forty-four million, three hundred ninety-one thousand, seven hundred sixty-four".