2940781 has 2 divisors, whose sum is σ = 2940782. Its totient is φ = 2940780.

The previous prime is 2940761. The next prime is 2940787. The reversal of 2940781 is 1870492.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2856100 + 84681 = 1690^2 + 291^2 .

It is a cyclic number.

It is not a de Polignac number, because 2940781 - 2¹⁵ = 2908013 is a prime.

It is a super-2 number, since 2×2940781² = 17296385779922, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2940787) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1470390 + 1470391.

It is an arithmetic number, because the mean of its divisors is an integer number (1470391).

2^2940781 is an apocalyptic number.

It is an amenable number.

2940781 is a deficient number, since it is larger than the sum of its proper divisors (1).

2940781 is an equidigital number, since it uses as much as digits as its factorization.

2940781 is an odious number, because the sum of its binary digits is odd.

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

The square root of 2940781 is about 1714.8705490503. The cubic root of 2940781 is about 143.2696592365.

It can be divided in two parts, 2940 and 781, that added together give a square (3721 = 61²).

The spelling of 2940781 in words is "two million, nine hundred forty thousand, seven hundred eighty-one".