1255015120 has 40 divisors (see below), whose sum is σ = 2921078664. Its totient is φ = 501460992.

The previous prime is 1255015109. The next prime is 1255015121. The reversal of 1255015120 is 215105521.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 359329936 + 895685184 = 18956^2 + 29928^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×1255015120² = 3150125902857228800, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1255015091 and 1255015100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1255015121) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 70132 + ... + 86188.

Almost surely, 2^1255015120 is an apocalyptic number.

1255015120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1255015120 is an abundant number, since it is smaller than the sum of its proper divisors (1666063544).

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

1255015120 is a wasteful number, since it uses less digits than its factorization.

1255015120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17047 (or 17041 counting only the distinct ones).

The product of its (nonzero) digits is 500, while the sum is 22.

The square root of 1255015120 is about 35426.1925699051. The cubic root of 1255015120 is about 1078.6560557798.

The spelling of 1255015120 in words is "one billion, two hundred fifty-five million, fifteen thousand, one hundred twenty".