2667981 has 4 divisors (see below), whose sum is σ = 3557312. Its totient is φ = 1778652.

The previous prime is 2667979. The next prime is 2667983. The reversal of 2667981 is 1897662.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (2667979) and next prime (2667983).

It is not a de Polignac number, because 2667981 - 2¹ = 2667979 is a prime.

It is a super-2 number, since 2×2667981² = 14236245232722, which contains 22 as substring.

It is a D-number.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2667983) 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, 444661 + ... + 444666.

It is an arithmetic number, because the mean of its divisors is an integer number (889328).

2^2667981 is an apocalyptic number.

It is an amenable number.

2667981 is a deficient number, since it is larger than the sum of its proper divisors (889331).

2667981 is an equidigital number, since it uses as much as digits as its factorization.

2667981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 889330.

The product of its digits is 36288, while the sum is 39.

The square root of 2667981 is about 1633.3955430330. The cubic root of 2667981 is about 138.6950338240.

The spelling of 2667981 in words is "two million, six hundred sixty-seven thousand, nine hundred eighty-one".