2190638 has 4 divisors (see below), whose sum is σ = 3285960. Its totient is φ = 1095318.

The previous prime is 2190613. The next prime is 2190647. The reversal of 2190638 is 8360912.

2190638 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 2190638.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 547658 + ... + 547661.

It is an arithmetic number, because the mean of its divisors is an integer number (821490).

2^2190638 is an apocalyptic number.

2190638 is a deficient number, since it is larger than the sum of its proper divisors (1095322).

2190638 is a wasteful number, since it uses less digits than its factorization.

2190638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1095321.

The product of its (nonzero) digits is 2592, while the sum is 29.

The square root of 2190638 is about 1480.0804032214. The cubic root of 2190638 is about 129.8743954466.

The spelling of 2190638 in words is "two million, one hundred ninety thousand, six hundred thirty-eight".