2781018 has 12 divisors (see below), whose sum is σ = 6025578. Its totient is φ = 927000.

The previous prime is 2781017. The next prime is 2781019. The reversal of 2781018 is 8101872.

It is an interprime number because it is at equal distance from previous prime (2781017) and next prime (2781019).

It can be written as a sum of positive squares in only one way, i.e., 1734489 + 1046529 = 1317^2 + 1023^2 .

It is a super-2 number, since 2×2781018² = 15468122232648, which contains 22 as substring.

It is an alternating number because its digits alternate between even and odd.

It is a junction number, because it is equal to n+sod(n) for n = 2780982 and 2781000.

It is not an unprimeable number, because it can be changed into a prime (2781017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 77233 + ... + 77268.

2^2781018 is an apocalyptic number.

2781018 is an abundant number, since it is smaller than the sum of its proper divisors (3244560).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2781018 is a wasteful number, since it uses less digits than its factorization.

2781018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 154509 (or 154506 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 27.

The square root of 2781018 is about 1667.6384500245. The cubic root of 2781018 is about 140.6267478301.

It can be divided in two parts, 278 and 1018, that added together give a 4-th power (1296 = 6⁴).

The spelling of 2781018 in words is "two million, seven hundred eighty-one thousand, eighteen".