2781490 has 8 divisors (see below), whose sum is σ = 5006700. Its totient is φ = 1112592.

The previous prime is 2781487. The next prime is 2781491. The reversal of 2781490 is 941872.

It can be written as a sum of positive squares in 2 ways, for example, as 2778889 + 2601 = 1667^2 + 51^2 .

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

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

It is not an unprimeable number, because it can be changed into a prime (2781491) 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, 139065 + ... + 139084.

2^2781490 is an apocalyptic number.

2781490 is a deficient number, since it is larger than the sum of its proper divisors (2225210).

2781490 is a wasteful number, since it uses less digits than its factorization.

2781490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 278156.

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

The square root of 2781490 is about 1667.7799615057. The cubic root of 2781490 is about 140.6347031988.

The spelling of 2781490 in words is "two million, seven hundred eighty-one thousand, four hundred ninety".