1265574940 has 72 divisors (see below), whose sum is σ = 3105784080. Its totient is φ = 431923968.

The previous prime is 1265574923. The next prime is 1265574943. The reversal of 1265574940 is 494755621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1265574943) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 219616 + ... + 225304.

It is an arithmetic number, because the mean of its divisors is an integer number (43135890).

Almost surely, 2^1265574940 is an apocalyptic number.

1265574940 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 1265574940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1552892040).

1265574940 is an abundant number, since it is smaller than the sum of its proper divisors (1840209140).

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

1265574940 is a wasteful number, since it uses less digits than its factorization.

1265574940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5939 (or 5930 counting only the distinct ones).

The product of its (nonzero) digits is 302400, while the sum is 43.

The square root of 1265574940 is about 35574.9200982940. The cubic root of 1265574940 is about 1081.6729160090.

The spelling of 1265574940 in words is "one billion, two hundred sixty-five million, five hundred seventy-four thousand, nine hundred forty".