1366399998 has 24 divisors (see below), whose sum is σ = 3010714200. Its totient is φ = 447746544.

The previous prime is 1366399987. The next prime is 1366400011. The reversal of 1366399998 is 8999936631.

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 642253 + ... + 644376.

It is an arithmetic number, because the mean of its divisors is an integer number (125446425).

Almost surely, 2^1366399998 is an apocalyptic number.

1366399998 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1366399998 is an abundant number, since it is smaller than the sum of its proper divisors (1644314202).

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

1366399998 is a wasteful number, since it uses less digits than its factorization.

1366399998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1286696 (or 1286693 counting only the distinct ones).

The product of its digits is 17006112, while the sum is 63.

The square root of 1366399998 is about 36964.8481398206. The cubic root of 1366399998 is about 1109.6668637487. Note that the first 3 decimals are identical.

The spelling of 1366399998 in words is "one billion, three hundred sixty-six million, three hundred ninety-nine thousand, nine hundred ninety-eight".