1298021742 has 12 divisors (see below), whose sum is σ = 2812380480. Its totient is φ = 432673908.

The previous prime is 1298021741. The next prime is 1298021789. The reversal of 1298021742 is 2471208921.

It is a junction number, because it is equal to n+sod(n) for n = 1298021697 and 1298021706.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1298021741) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 36056142 + ... + 36056177.

It is an arithmetic number, because the mean of its divisors is an integer number (234365040).

Almost surely, 2^1298021742 is an apocalyptic number.

1298021742 is an abundant number, since it is smaller than the sum of its proper divisors (1514358738).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1298021742 is a wasteful number, since it uses less digits than its factorization.

1298021742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72112327 (or 72112324 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 36.

The square root of 1298021742 is about 36028.0688075284. The cubic root of 1298021742 is about 1090.8389977275.

The spelling of 1298021742 in words is "one billion, two hundred ninety-eight million, twenty-one thousand, seven hundred forty-two".