3981547 has 4 divisors (see below), whose sum is σ = 4110016. Its totient is φ = 3853080.

The previous prime is 3981541. The next prime is 3981563. The reversal of 3981547 is 7451893.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 3981547 - 2³ = 3981539 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3981541) 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, 64188 + ... + 64249.

It is an arithmetic number, because the mean of its divisors is an integer number (1027504).

Almost surely, 2^3981547 is an apocalyptic number.

3981547 is a deficient number, since it is larger than the sum of its proper divisors (128469).

3981547 is a wasteful number, since it uses less digits than its factorization.

3981547 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128468.

The product of its digits is 30240, while the sum is 37.

The square root of 3981547 is about 1995.3814171732. The cubic root of 3981547 is about 158.4956262663.

It can be divided in two parts, 398154 and 7, that added together give a square (398161 = 631²).

The spelling of 3981547 in words is "three million, nine hundred eighty-one thousand, five hundred forty-seven".