1275240400 has 60 divisors (see below), whose sum is σ = 3501453472. Its totient is φ = 437224320.

The previous prime is 1275240391. The next prime is 1275240479. The reversal of 1275240400 is 40425721.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 224922 + ... + 230521.

Almost surely, 2^1275240400 is an apocalyptic number.

1275240400 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1275240400 is an abundant number, since it is smaller than the sum of its proper divisors (2226213072).

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

1275240400 is a wasteful number, since it uses less digits than its factorization.

1275240400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 455468 (or 455457 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 25.

The square root of 1275240400 is about 35710.5082573743. The cubic root of 1275240400 is about 1084.4195894761.

The spelling of 1275240400 in words is "one billion, two hundred seventy-five million, two hundred forty thousand, four hundred".