2138998 has 4 divisors (see below), whose sum is σ = 3208500. Its totient is φ = 1069498.

The previous prime is 2138989. The next prime is 2138999. The reversal of 2138998 is 8998312.

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

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 2138998.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2138999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 534748 + ... + 534751.

It is an arithmetic number, because the mean of its divisors is an integer number (802125).

2^2138998 is an apocalyptic number.

2138998 is a deficient number, since it is larger than the sum of its proper divisors (1069502).

2138998 is a wasteful number, since it uses less digits than its factorization.

2138998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1069501.

The product of its digits is 31104, while the sum is 40.

The square root of 2138998 is about 1462.5313671850. The cubic root of 2138998 is about 128.8457584031.

It can be divided in two parts, 2138 and 998, that added together give a square (3136 = 56²).

The spelling of 2138998 in words is "two million, one hundred thirty-eight thousand, nine hundred ninety-eight".