1296991742 has 4 divisors (see below), whose sum is σ = 1945487616. Its totient is φ = 648495870.

The previous prime is 1296991681. The next prime is 1296991769. The reversal of 1296991742 is 2471996921.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 2471996921 = 23 ⋅107478127.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 324247934 + ... + 324247937.

It is an arithmetic number, because the mean of its divisors is an integer number (486371904).

Almost surely, 2^1296991742 is an apocalyptic number.

1296991742 is a deficient number, since it is larger than the sum of its proper divisors (648495874).

1296991742 is an equidigital number, since it uses as much as digits as its factorization.

1296991742 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 648495873.

The product of its digits is 489888, while the sum is 50.

The square root of 1296991742 is about 36013.7715603351. The cubic root of 1296991742 is about 1090.5503889288.

The spelling of 1296991742 in words is "one billion, two hundred ninety-six million, nine hundred ninety-one thousand, seven hundred forty-two".