2139378 has 8 divisors (see below), whose sum is σ = 4278768. Its totient is φ = 713124.

The previous prime is 2139373. The next prime is 2139383. The reversal of 2139378 is 8739312.

It is an interprime number because it is at equal distance from previous prime (2139373) and next prime (2139383).

It is a sphenic number, since it is the product of 3 distinct primes.

2139378 is an admirable number.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (2139373) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 178276 + ... + 178287.

It is an arithmetic number, because the mean of its divisors is an integer number (534846).

2^2139378 is an apocalyptic number.

2139378 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

2139378 is a wasteful number, since it uses less digits than its factorization.

2139378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 356568.

The product of its digits is 9072, while the sum is 33.

The square root of 2139378 is about 1462.6612731593. The cubic root of 2139378 is about 128.8533879083.

It can be divided in two parts, 213 and 9378, that added together give a triangular number (9591 = T₁₃₈).

The spelling of 2139378 in words is "two million, one hundred thirty-nine thousand, three hundred seventy-eight".