1272840249 has 8 divisors (see below), whose sum is σ = 1712139552. Its totient is φ = 841050560.

The previous prime is 1272840241. The next prime is 1272840251. The reversal of 1272840249 is 9420482721.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1272840249 - 2³ = 1272840241 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1272840241) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1877007 + ... + 1877684.

It is an arithmetic number, because the mean of its divisors is an integer number (214017444).

Almost surely, 2^1272840249 is an apocalyptic number.

It is an amenable number.

1272840249 is a deficient number, since it is larger than the sum of its proper divisors (439299303).

1272840249 is a wasteful number, since it uses less digits than its factorization.

1272840249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3754807.

The product of its (nonzero) digits is 64512, while the sum is 39.

The square root of 1272840249 is about 35676.8867615996. The cubic root of 1272840249 is about 1083.7388275383.

The spelling of 1272840249 in words is "one billion, two hundred seventy-two million, eight hundred forty thousand, two hundred forty-nine".