2739981 has 4 divisors (see below), whose sum is σ = 3653312. Its totient is φ = 1826652.

The previous prime is 2739977. The next prime is 2739983. The reversal of 2739981 is 1899372.

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 not a de Polignac number, because 2739981 - 2² = 2739977 is a prime.

It is a super-2 number, since 2×2739981² = 15014991760722, which contains 22 as substring.

It is a d-powerful number, because it can be written as 2¹⁹ + 7⁶ + 3⁶ + 9² + 9² + 8⁷ + 1 .

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2739983) 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, 456661 + ... + 456666.

It is an arithmetic number, because the mean of its divisors is an integer number (913328).

2^2739981 is an apocalyptic number.

It is an amenable number.

2739981 is a deficient number, since it is larger than the sum of its proper divisors (913331).

2739981 is an equidigital number, since it uses as much as digits as its factorization.

2739981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 913330.

The product of its digits is 27216, while the sum is 39.

The square root of 2739981 is about 1655.2887965548. The cubic root of 2739981 is about 139.9316162629.

The spelling of 2739981 in words is "two million, seven hundred thirty-nine thousand, nine hundred eighty-one".