1298821844 has 6 divisors (see below), whose sum is σ = 2272938234. Its totient is φ = 649410920.

The previous prime is 1298821831. The next prime is 1298821847. The reversal of 1298821844 is 4481288921.

It can be written as a sum of positive squares in only one way, i.e., 1098259600 + 200562244 = 33140^2 + 14162^2 .

It is a congruent number.

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 as a sum of consecutive naturals, namely, 162352727 + ... + 162352734.

It is an arithmetic number, because the mean of its divisors is an integer number (378823039).

Almost surely, 2^1298821844 is an apocalyptic number.

It is an amenable number.

1298821844 is a deficient number, since it is larger than the sum of its proper divisors (974116390).

1298821844 is a wasteful number, since it uses less digits than its factorization.

1298821844 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 324705465 (or 324705463 counting only the distinct ones).

The product of its digits is 294912, while the sum is 47.

The square root of 1298821844 is about 36039.1709671574. The cubic root of 1298821844 is about 1091.0630831361.

The spelling of 1298821844 in words is "one billion, two hundred ninety-eight million, eight hundred twenty-one thousand, eight hundred forty-four".