2719981 has 16 divisors (see below), whose sum is σ = 3140928. Its totient is φ = 2332800.

The previous prime is 2719943. The next prime is 2719987. The reversal of 2719981 is 1899172.

It is a 4-Lehmer number, since φ(2719981) divides (2719981-1)⁴.

It is a cyclic number.

It is not a de Polignac number, because 2719981 - 2¹⁵ = 2687213 is a prime.

It is a super-2 number, since 2×2719981² = 14796593280722, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a deceptive number, since it divides R_2719980.

Its product of digits (9072) is a multiple of the sum of its prime divisors (252).

It is a self number, because there is not a number n which added to its sum of digits gives 2719981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2719987) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16606 + ... + 16768.

It is an arithmetic number, because the mean of its divisors is an integer number (196308).

It is a Poulet number, since it divides 2^2719980-1.

2^2719981 is an apocalyptic number.

It is an amenable number.

2719981 is a deficient number, since it is larger than the sum of its proper divisors (420947).

2719981 is a wasteful number, since it uses less digits than its factorization.

2719981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 252.

The product of its digits is 9072, while the sum is 37.

The square root of 2719981 is about 1649.2364900159. The cubic root of 2719981 is about 139.5903159102.

The spelling of 2719981 in words is "two million, seven hundred nineteen thousand, nine hundred eighty-one".