2140906 has 4 divisors (see below), whose sum is σ = 3211362. Its totient is φ = 1070452.

The previous prime is 2140903. The next prime is 2140907. The reversal of 2140906 is 6090412.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1190281 + 950625 = 1091^2 + 975^2 .

It is a Smith number, since the sum of its digits (22) 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 (2140903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 535225 + ... + 535228.

2^2140906 is an apocalyptic number.

2140906 is a deficient number, since it is larger than the sum of its proper divisors (1070456).

2140906 is a wasteful number, since it uses less digits than its factorization.

2140906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1070455.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 2140906 is about 1463.1835154894. The cubic root of 2140906 is about 128.8840574333.

The spelling of 2140906 in words is "two million, one hundred forty thousand, nine hundred six".