1255120040 has 32 divisors (see below), whose sum is σ = 2825469000. Its totient is φ = 501790464.

The previous prime is 1255120021. The next prime is 1255120103. The reversal of 1255120040 is 400215521.

It can be written as a sum of positive squares in 4 ways, for example, as 430396516 + 824723524 = 20746^2 + 28718^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 1255119994 and 1255120021.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 83846 + ... + 97674.

Almost surely, 2^1255120040 is an apocalyptic number.

1255120040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1255120040 is an abundant number, since it is smaller than the sum of its proper divisors (1570348960).

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

1255120040 is a wasteful number, since it uses less digits than its factorization.

1255120040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16109 (or 16105 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 20.

The square root of 1255120040 is about 35427.6733641937. The cubic root of 1255120040 is about 1078.6861137018.

Adding to 1255120040 its reverse (400215521), we get a palindrome (1655335561).

The spelling of 1255120040 in words is "one billion, two hundred fifty-five million, one hundred twenty thousand, forty".