2139918 has 16 divisors (see below), whose sum is σ = 4669056. Its totient is φ = 648440.

The previous prime is 2139911. The next prime is 2139919. The reversal of 2139918 is 8199312.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2139911) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16146 + ... + 16277.

It is an arithmetic number, because the mean of its divisors is an integer number (291816).

2^2139918 is an apocalyptic number.

2139918 is an abundant number, since it is smaller than the sum of its proper divisors (2529138).

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

2139918 is a wasteful number, since it uses less digits than its factorization.

2139918 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32439.

The product of its digits is 3888, while the sum is 33.

The square root of 2139918 is about 1462.8458565413. The cubic root of 2139918 is about 128.8642282828.

2139918 divided by its sum of digits (33) gives a palindrome (64846).

The spelling of 2139918 in words is "two million, one hundred thirty-nine thousand, nine hundred eighteen".