19741981 has 16 divisors (see below), whose sum is σ = 24931584. Its totient is φ = 15231744.

The previous prime is 19741973. The next prime is 19741991. The reversal of 19741981 is 18914791.

19741981 = 69² + 70² + ... + 390².

It is a cyclic number.

It is not a de Polignac number, because 19741981 - 2³ = 19741973 is a prime.

It is a super-2 number, since 2×19741981² = 779491627608722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19741921) 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, 870 + ... + 6343.

It is an arithmetic number, because the mean of its divisors is an integer number (1558224).

Almost surely, 2^19741981 is an apocalyptic number.

It is an amenable number.

19741981 is a deficient number, since it is larger than the sum of its proper divisors (5189603).

19741981 is a wasteful number, since it uses less digits than its factorization.

19741981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7260.

The product of its digits is 18144, while the sum is 40.

The square root of 19741981 is about 4443.1949090716. The cubic root of 19741981 is about 270.2694201408.

The spelling of 19741981 in words is "nineteen million, seven hundred forty-one thousand, nine hundred eighty-one".