1272134890 has 48 divisors (see below), whose sum is σ = 2488042872. Its totient is φ = 465543936.

The previous prime is 1272134887. The next prime is 1272134893. The reversal of 1272134890 is 984312721.

It is a Cunningham number, because it is equal to 35667²+1.

It is an interprime number because it is at equal distance from previous prime (1272134887) and next prime (1272134893).

It can be written as a sum of positive squares in 12 ways, for example, as 1 + 1272134889 = 1^2 + 35667^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1272134893) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3204172 + ... + 3204568.

Almost surely, 2^1272134890 is an apocalyptic number.

1272134890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1272134890 is a deficient number, since it is larger than the sum of its proper divisors (1215907982).

1272134890 is a wasteful number, since it uses less digits than its factorization.

1272134890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 731 (or 574 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 37.

The square root of 1272134890 is about 35667.0000140186. Note that the first 4 decimals coincide. The cubic root of 1272134890 is about 1083.5386017873.

The spelling of 1272134890 in words is "one billion, two hundred seventy-two million, one hundred thirty-four thousand, eight hundred ninety".