3998558138 has 4 divisors (see below), whose sum is σ = 5997837210. Its totient is φ = 1999279068.

The previous prime is 3998558101. The next prime is 3998558149. The reversal of 3998558138 is 8318558993.

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

It can be written as a sum of positive squares in only one way, i.e., 3843132049 + 155426089 = 61993^2 + 12467^2 .

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 as a sum of consecutive naturals, namely, 999639533 + ... + 999639536.

Almost surely, 2^3998558138 is an apocalyptic number.

3998558138 is a deficient number, since it is larger than the sum of its proper divisors (1999279072).

3998558138 is a wasteful number, since it uses less digits than its factorization.

3998558138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1999279071.

The product of its digits is 9331200, while the sum is 59.

The square root of 3998558138 is about 63234.1532559739. The cubic root of 3998558138 is about 1587.2102946079.

The spelling of 3998558138 in words is "three billion, nine hundred ninety-eight million, five hundred fifty-eight thousand, one hundred thirty-eight".