2138490 has 24 divisors (see below), whose sum is σ = 5560308. Its totient is φ = 570240.

The previous prime is 2138483. The next prime is 2138491. The reversal of 2138490 is 948312.

It can be written as a sum of positive squares in 2 ways, for example, as 2134521 + 3969 = 1461^2 + 63^2 .

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (2138491) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11791 + ... + 11970.

2^2138490 is an apocalyptic number.

2138490 is an abundant number, since it is smaller than the sum of its proper divisors (3421818).

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

2138490 is a wasteful number, since it uses less digits than its factorization.

2138490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23774 (or 23771 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 2138490 is about 1462.3576853834. The cubic root of 2138490 is about 128.8355575477.

It can be divided in two parts, 2138 and 490, that added together give a triangular number (2628 = T₇₂).

The spelling of 2138490 in words is "two million, one hundred thirty-eight thousand, four hundred ninety".