1275388900 has 18 divisors (see below), whose sum is σ = 2767594130. Its totient is φ = 510155520.

The previous prime is 1275388897. The next prime is 1275388903. The reversal of 1275388900 is 98835721.

It is an interprime number because it is at equal distance from previous prime (1275388897) and next prime (1275388903).

It can be written as a sum of positive squares in 3 ways, for example, as 28451556 + 1246937344 = 5334^2 + 35312^2 .

It is not an unprimeable number, because it can be changed into a prime (1275388903) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 6376845 + ... + 6377044.

Almost surely, 2^1275388900 is an apocalyptic number.

1275388900 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1275388900 is an abundant number, since it is smaller than the sum of its proper divisors (1492205230).

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

1275388900 is a wasteful number, since it uses less digits than its factorization.

1275388900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12753903 (or 12753896 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 43.

The square root of 1275388900 is about 35712.5874167639. The cubic root of 1275388900 is about 1084.4616809015.

The spelling of 1275388900 in words is "one billion, two hundred seventy-five million, three hundred eighty-eight thousand, nine hundred".