1273990249 has 9 divisors (see below), whose sum is σ = 1482279357. Its totient is φ = 1091777484.

The previous prime is 1273990247. The next prime is 1273990273. The reversal of 1273990249 is 9420993721.

It is a happy number.

The square root of 1273990249 is 35693.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 1273990249 - 2¹ = 1273990247 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1273990199 and 1273990208.

It is not an unprimeable number, because it can be changed into a prime (1273990243) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 247302 + ... + 252400.

Almost surely, 2^1273990249 is an apocalyptic number.

1273990249 is the 35693-rd square number.

1273990249 is the 17847-th centered octagonal number.

It is an amenable number.

1273990249 is a deficient number, since it is larger than the sum of its proper divisors (208289108).

1273990249 is an frugal number, since it uses more digits than its factorization.

1273990249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10212 (or 5106 counting only the distinct ones).

The product of its (nonzero) digits is 244944, while the sum is 46.

The cubic root of 1273990249 is about 1084.0651121344.

The spelling of 1273990249 in words is "one billion, two hundred seventy-three million, nine hundred ninety thousand, two hundred forty-nine".