1253440100 has 36 divisors (see below), whose sum is σ = 2967237168. Its totient is φ = 455796000.

The previous prime is 1253440093. The next prime is 1253440103. The reversal of 1253440100 is 10443521.

It is a super-2 number, since 2×1253440100² = 3142224168576020000, which contains 22 as substring.

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

It is not an unprimeable number, because it can be changed into a prime (1253440103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 568646 + ... + 570845.

Almost surely, 2^1253440100 is an apocalyptic number.

1253440100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1253440100 is an abundant number, since it is smaller than the sum of its proper divisors (1713797068).

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

1253440100 is a wasteful number, since it uses less digits than its factorization.

1253440100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1139516 (or 1139509 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 1253440100 is about 35403.9559936457. The cubic root of 1253440100 is about 1078.2046359715.

Adding to 1253440100 its reverse (10443521), we get a palindrome (1263883621).

The spelling of 1253440100 in words is "one billion, two hundred fifty-three million, four hundred forty thousand, one hundred".