1297977428 has 12 divisors (see below), whose sum is σ = 2477956992. Its totient is φ = 589989720.

The previous prime is 1297977397. The next prime is 1297977431. The reversal of 1297977428 is 8247797921.

It is a hoax number, since the sum of its digits (56) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14749700 + ... + 14749787.

It is an arithmetic number, because the mean of its divisors is an integer number (206496416).

Almost surely, 2^1297977428 is an apocalyptic number.

It is an amenable number.

1297977428 is a deficient number, since it is larger than the sum of its proper divisors (1179979564).

1297977428 is a wasteful number, since it uses less digits than its factorization.

1297977428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29499502 (or 29499500 counting only the distinct ones).

The product of its digits is 3556224, while the sum is 56.

The square root of 1297977428 is about 36027.4538095603. The cubic root of 1297977428 is about 1090.8265839680.

The spelling of 1297977428 in words is "one billion, two hundred ninety-seven million, nine hundred seventy-seven thousand, four hundred twenty-eight".