1213881998 has 24 divisors (see below), whose sum is σ = 2169768384. Its totient is φ = 507544800.

The previous prime is 1213881983. The next prime is 1213882003. The reversal of 1213881998 is 8991883121.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 147038 + ... + 155073.

It is an arithmetic number, because the mean of its divisors is an integer number (90407016).

Almost surely, 2^1213881998 is an apocalyptic number.

1213881998 is a deficient number, since it is larger than the sum of its proper divisors (955886386).

1213881998 is a wasteful number, since it uses less digits than its factorization.

1213881998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 302168 (or 302161 counting only the distinct ones).

The product of its digits is 248832, while the sum is 50.

The square root of 1213881998 is about 34840.8093763621. The cubic root of 1213881998 is about 1066.7405975884.

The spelling of 1213881998 in words is "one billion, two hundred thirteen million, eight hundred eighty-one thousand, nine hundred ninety-eight".