1277897949 has 12 divisors (see below), whose sum is σ = 1846283712. Its totient is φ = 851733000.

The previous prime is 1277897947. The next prime is 1277897981. The reversal of 1277897949 is 9497987721.

It is not a de Polignac number, because 1277897949 - 2¹ = 1277897947 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1277897947) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 31404 + ... + 59514.

It is an arithmetic number, because the mean of its divisors is an integer number (153856976).

Almost surely, 2^1277897949 is an apocalyptic number.

It is an amenable number.

1277897949 is a deficient number, since it is larger than the sum of its proper divisors (568385763).

1277897949 is a wasteful number, since it uses less digits than its factorization.

1277897949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33168 (or 33165 counting only the distinct ones).

The product of its digits is 16003008, while the sum is 63.

The square root of 1277897949 is about 35747.6985133309. The cubic root of 1277897949 is about 1085.1723622057.

The spelling of 1277897949 in words is "one billion, two hundred seventy-seven million, eight hundred ninety-seven thousand, nine hundred forty-nine".