4188981 has 4 divisors (see below), whose sum is σ = 5585312. Its totient is φ = 2792652.

The previous prime is 4188973. The next prime is 4188991. The reversal of 4188981 is 1898814.

It is a happy number.

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 4188981 - 2³ = 4188973 is a prime.

It is a super-2 number, since 2×4188981² = 35095123636722, which contains 22 as substring.

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 (4188901) 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, 698161 + ... + 698166.

It is an arithmetic number, because the mean of its divisors is an integer number (1396328).

Almost surely, 2^4188981 is an apocalyptic number.

It is an amenable number.

4188981 is a deficient number, since it is larger than the sum of its proper divisors (1396331).

4188981 is a wasteful number, since it uses less digits than its factorization.

4188981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1396330.

The product of its digits is 18432, while the sum is 39.

The square root of 4188981 is about 2046.7000268725. The cubic root of 4188981 is about 161.2016428520.

The spelling of 4188981 in words is "four million, one hundred eighty-eight thousand, nine hundred eighty-one".