2072781 has 6 divisors (see below), whose sum is σ = 2994030. Its totient is φ = 1381848.

The previous prime is 2072773. The next prime is 2072789. The reversal of 2072781 is 1872702.

It is an interprime number because it is at equal distance from previous prime (2072773) and next prime (2072789).

It can be written as a sum of positive squares in only one way, i.e., 1988100 + 84681 = 1410^2 + 291^2 .

It is not a de Polignac number, because 2072781 - 2³ = 2072773 is a prime.

It is a super-2 number, since 2×2072781² = 8592842147922, which contains 22 as substring.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2072789) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 115146 + ... + 115163.

It is an arithmetic number, because the mean of its divisors is an integer number (499005).

2^2072781 is an apocalyptic number.

It is an amenable number.

2072781 is a deficient number, since it is larger than the sum of its proper divisors (921249).

2072781 is a wasteful number, since it uses less digits than its factorization.

2072781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 230315 (or 230312 counting only the distinct ones).

The product of its (nonzero) digits is 1568, while the sum is 27.

The square root of 2072781 is about 1439.7155969149. The cubic root of 2072781 is about 127.5022375617.

The spelling of 2072781 in words is "two million, seventy-two thousand, seven hundred eighty-one".