2138378 has 24 divisors (see below), whose sum is σ = 3646944. Its totient is φ = 932400.

The previous prime is 2138377. The next prime is 2138387. The reversal of 2138378 is 8738312.

It is a Smith number, since the sum of its digits (32) coincides with the sum of the digits of its prime factors.

It is a d-powerful number, because it can be written as 2²⁰ + 1 + 3² + 8⁴ + 3² + 7⁷ + 8⁶ .

It is not an unprimeable number, because it can be changed into a prime (2138371) 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, 30083 + ... + 30153.

It is an arithmetic number, because the mean of its divisors is an integer number (151956).

2^2138378 is an apocalyptic number.

2138378 is a deficient number, since it is larger than the sum of its proper divisors (1508566).

2138378 is a wasteful number, since it uses less digits than its factorization.

2138378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 158 (or 121 counting only the distinct ones).

The product of its digits is 8064, while the sum is 32.

The square root of 2138378 is about 1462.3193905573. The cubic root of 2138378 is about 128.8333083229.

The spelling of 2138378 in words is "two million, one hundred thirty-eight thousand, three hundred seventy-eight".