1298456838 has 64 divisors (see below), whose sum is σ = 3491665920. Its totient is φ = 349163136.

The previous prime is 1298456833. The next prime is 1298456843. The reversal of 1298456838 is 8386548921.

It is an interprime number because it is at equal distance from previous prime (1298456833) and next prime (1298456843).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1298456833) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 94606 + ... + 107457.

It is an arithmetic number, because the mean of its divisors is an integer number (54557280).

Almost surely, 2^1298456838 is an apocalyptic number.

1298456838 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1298456838 is an abundant number, since it is smaller than the sum of its proper divisors (2193209082).

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

1298456838 is a wasteful number, since it uses less digits than its factorization.

1298456838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 202098 (or 202092 counting only the distinct ones).

The product of its digits is 3317760, while the sum is 54.

The square root of 1298456838 is about 36034.1065936149. The cubic root of 1298456838 is about 1090.9608669403.

The spelling of 1298456838 in words is "one billion, two hundred ninety-eight million, four hundred fifty-six thousand, eight hundred thirty-eight".