139281998 has 4 divisors (see below), whose sum is σ = 208923000. Its totient is φ = 69640998.

The previous prime is 139281991. The next prime is 139282001. The reversal of 139281998 is 899182931.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139281991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34820498 + ... + 34820501.

It is an arithmetic number, because the mean of its divisors is an integer number (52230750).

Almost surely, 2^139281998 is an apocalyptic number.

139281998 is a deficient number, since it is larger than the sum of its proper divisors (69641002).

139281998 is an equidigital number, since it uses as much as digits as its factorization.

139281998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69641001.

The product of its digits is 279936, while the sum is 50.

The square root of 139281998 is about 11801.7794421011. The cubic root of 139281998 is about 518.3602166440.

The spelling of 139281998 in words is "one hundred thirty-nine million, two hundred eighty-one thousand, nine hundred ninety-eight".