1297789642 has 16 divisors (see below), whose sum is σ = 2115244800. Its totient is φ = 594911520.

The previous prime is 1297789637. The next prime is 1297789657. The reversal of 1297789642 is 2469877921.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 549667 + ... + 552022.

It is an arithmetic number, because the mean of its divisors is an integer number (132202800).

Almost surely, 2^1297789642 is an apocalyptic number.

1297789642 is a deficient number, since it is larger than the sum of its proper divisors (817455158).

1297789642 is a wasteful number, since it uses less digits than its factorization.

1297789642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1101741.

The product of its digits is 3048192, while the sum is 55.

The square root of 1297789642 is about 36024.8475638690. The cubic root of 1297789642 is about 1090.7739760063.

The spelling of 1297789642 in words is "one billion, two hundred ninety-seven million, seven hundred eighty-nine thousand, six hundred forty-two".