2940821 has 4 divisors (see below), whose sum is σ = 3167052. Its totient is φ = 2714592.

The previous prime is 2940799. The next prime is 2940853. The reversal of 2940821 is 1280492.

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

It can be written as a sum of positive squares in 2 ways, for example, as 504100 + 2436721 = 710^2 + 1561^2 .

It is a cyclic number.

It is not a de Polignac number, because 2940821 - 2¹⁴ = 2924437 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2940521) 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, 113096 + ... + 113121.

It is an arithmetic number, because the mean of its divisors is an integer number (791763).

2^2940821 is an apocalyptic number.

It is an amenable number.

2940821 is a deficient number, since it is larger than the sum of its proper divisors (226231).

2940821 is a wasteful number, since it uses less digits than its factorization.

2940821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 226230.

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 2940821 is about 1714.8822116985. The cubic root of 2940821 is about 143.2703088100.

The spelling of 2940821 in words is "two million, nine hundred forty thousand, eight hundred twenty-one".