1265152020 has 96 divisors (see below), whose sum is σ = 3954424320. Its totient is φ = 299564160.

The previous prime is 1265151983. The next prime is 1265152033. The reversal of 1265152020 is 202515621.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6091 + ... + 50669.

It is an arithmetic number, because the mean of its divisors is an integer number (41191920).

Almost surely, 2^1265152020 is an apocalyptic number.

1265152020 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 1265152020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1977212160).

1265152020 is an abundant number, since it is smaller than the sum of its proper divisors (2689272300).

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

1265152020 is a wasteful number, since it uses less digits than its factorization.

1265152020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44645 (or 44643 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 24.

The square root of 1265152020 is about 35568.9755264331. The cubic root of 1265152020 is about 1081.5524142350.

Adding to 1265152020 its reverse (202515621), we get a palindrome (1467667641).

The spelling of 1265152020 in words is "one billion, two hundred sixty-five million, one hundred fifty-two thousand, twenty".