2942781 has 8 divisors (see below), whose sum is σ = 4094400. Its totient is φ = 1876512.

The previous prime is 2942767. The next prime is 2942783. The reversal of 2942781 is 1872492.

It is a happy number.

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

It is not a de Polignac number, because 2942781 - 2⁵ = 2942749 is a prime.

It is a super-2 number, since 2×2942781² = 17319920027922, which contains 22 as substring.

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 an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2942783) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21256 + ... + 21393.

It is an arithmetic number, because the mean of its divisors is an integer number (511800).

2^2942781 is an apocalyptic number.

It is an amenable number.

2942781 is a deficient number, since it is larger than the sum of its proper divisors (1151619).

2942781 is a wasteful number, since it uses less digits than its factorization.

2942781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42675.

The product of its digits is 8064, while the sum is 33.

The square root of 2942781 is about 1715.4535843327. The cubic root of 2942781 is about 143.3021306996.

The spelling of 2942781 in words is "two million, nine hundred forty-two thousand, seven hundred eighty-one".