1280121272 has 8 divisors (see below), whose sum is σ = 2400227400. Its totient is φ = 640060632.

The previous prime is 1280121263. The next prime is 1280121307. The reversal of 1280121272 is 2721210821.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80007572 + ... + 80007587.

It is an arithmetic number, because the mean of its divisors is an integer number (300028425).

Almost surely, 2^1280121272 is an apocalyptic number.

It is an amenable number.

1280121272 is a deficient number, since it is larger than the sum of its proper divisors (1120106128).

1280121272 is a wasteful number, since it uses less digits than its factorization.

1280121272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160015165 (or 160015161 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 26.

The square root of 1280121272 is about 35778.7824275785. The cubic root of 1280121272 is about 1085.8013354356.

The spelling of 1280121272 in words is "one billion, two hundred eighty million, one hundred twenty-one thousand, two hundred seventy-two".