2139678 has 24 divisors (see below), whose sum is σ = 4797000. Its totient is φ = 688464.

The previous prime is 2139677. The next prime is 2139691. The reversal of 2139678 is 8769312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2139677) 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, 1528 + ... + 2571.

It is an arithmetic number, because the mean of its divisors is an integer number (199875).

2^2139678 is an apocalyptic number.

2139678 is an abundant number, since it is smaller than the sum of its proper divisors (2657322).

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

2139678 is a wasteful number, since it uses less digits than its factorization.

2139678 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4136 (or 4133 counting only the distinct ones).

The product of its digits is 18144, while the sum is 36.

The square root of 2139678 is about 1462.7638223582. The cubic root of 2139678 is about 128.8594105637.

The spelling of 2139678 in words is "two million, one hundred thirty-nine thousand, six hundred seventy-eight".