138214998 has 48 divisors (see below), whose sum is σ = 328844880. Its totient is φ = 43358976.

The previous prime is 138214991. The next prime is 138215023. The reversal of 138214998 is 899412831.

138214998 is a `hidden beast` number, since 138 + 21 + 499 + 8 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138214991) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 103 + ... + 16626.

It is an arithmetic number, because the mean of its divisors is an integer number (6850935).

Almost surely, 2^138214998 is an apocalyptic number.

138214998 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 138214998, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (164422440).

138214998 is an abundant number, since it is smaller than the sum of its proper divisors (190629882).

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

138214998 is a wasteful number, since it uses less digits than its factorization.

138214998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16763 (or 16751 counting only the distinct ones).

The product of its digits is 124416, while the sum is 45.

The square root of 138214998 is about 11756.4874856396. The cubic root of 138214998 is about 517.0331517513.

The spelling of 138214998 in words is "one hundred thirty-eight million, two hundred fourteen thousand, nine hundred ninety-eight".