2681990 has 8 divisors (see below), whose sum is σ = 4827600. Its totient is φ = 1072792.

The previous prime is 2681989. The next prime is 2681993. The reversal of 2681990 is 991862.

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

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 2681990.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2681993) 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, 134090 + ... + 134109.

It is an arithmetic number, because the mean of its divisors is an integer number (603450).

2^2681990 is an apocalyptic number.

2681990 is a deficient number, since it is larger than the sum of its proper divisors (2145610).

2681990 is a wasteful number, since it uses less digits than its factorization.

2681990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 268206.

The product of its (nonzero) digits is 7776, while the sum is 35.

The square root of 2681990 is about 1637.6782345748. The cubic root of 2681990 is about 138.9373628726.

The spelling of 2681990 in words is "two million, six hundred eighty-one thousand, nine hundred ninety".