2138390 has 16 divisors (see below), whose sum is σ = 3939408. Its totient is φ = 835296.

The previous prime is 2138387. The next prime is 2138399. The reversal of 2138390 is 938312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2138399) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2057 + ... + 2916.

It is an arithmetic number, because the mean of its divisors is an integer number (246213).

2^2138390 is an apocalyptic number.

2138390 is a deficient number, since it is larger than the sum of its proper divisors (1801018).

2138390 is a wasteful number, since it uses less digits than its factorization.

2138390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5023.

The product of its (nonzero) digits is 1296, while the sum is 26.

The square root of 2138390 is about 1462.3234936224. The cubic root of 2138390 is about 128.8335493151.

The spelling of 2138390 in words is "two million, one hundred thirty-eight thousand, three hundred ninety".