2981906 has 4 divisors (see below), whose sum is σ = 4472862. Its totient is φ = 1490952.

The previous prime is 2981903. The next prime is 2981911. The reversal of 2981906 is 6091892.

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., 2356225 + 625681 = 1535^2 + 791^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2981903) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 745475 + ... + 745478.

2^2981906 is an apocalyptic number.

2981906 is a deficient number, since it is larger than the sum of its proper divisors (1490956).

2981906 is a wasteful number, since it uses less digits than its factorization.

2981906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1490955.

The product of its (nonzero) digits is 7776, while the sum is 35.

The square root of 2981906 is about 1726.8196199951. The cubic root of 2981906 is about 143.9344158650.

The spelling of 2981906 in words is "two million, nine hundred eighty-one thousand, nine hundred six".