2140978 has 32 divisors (see below), whose sum is σ = 3928320. Its totient is φ = 855360.

The previous prime is 2140973. The next prime is 2140987. The reversal of 2140978 is 8790412.

It is a Smith number, since the sum of its digits (31) 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 (2140973) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19588 + ... + 19696.

It is an arithmetic number, because the mean of its divisors is an integer number (122760).

2^2140978 is an apocalyptic number.

2140978 is a deficient number, since it is larger than the sum of its proper divisors (1787342).

2140978 is a wasteful number, since it uses less digits than its factorization.

2140978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 202.

The product of its (nonzero) digits is 4032, while the sum is 31.

The square root of 2140978 is about 1463.2081191683. The cubic root of 2140978 is about 128.8855022341.

The spelling of 2140978 in words is "two million, one hundred forty thousand, nine hundred seventy-eight".