1298821842 has 24 divisors (see below), whose sum is σ = 2814824844. Its totient is φ = 432831264.

The previous prime is 1298821831. The next prime is 1298821847. The reversal of 1298821842 is 2481288921.

It can be written as a sum of positive squares in 2 ways, for example, as 1298809521 + 12321 = 36039^2 + 111^2 .

It is not an unprimeable number, because it can be changed into a prime (1298821847) 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, 98428 + ... + 110840.

Almost surely, 2^1298821842 is an apocalyptic number.

1298821842 is an abundant number, since it is smaller than the sum of its proper divisors (1516003002).

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

1298821842 is a wasteful number, since it uses less digits than its factorization.

1298821842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18234 (or 18231 counting only the distinct ones).

The product of its digits is 147456, while the sum is 45.

The square root of 1298821842 is about 36039.1709394098. The cubic root of 1298821842 is about 1091.0630825761.

The spelling of 1298821842 in words is "one billion, two hundred ninety-eight million, eight hundred twenty-one thousand, eight hundred forty-two".