3728981 has 4 divisors (see below), whose sum is σ = 3739200. Its totient is φ = 3718764.

The previous prime is 3728969. The next prime is 3728983. The reversal of 3728981 is 1898273.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1898273 = 13 ⋅146021.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3728981 is a prime.

It is a super-2 number, since 2×3728981² = 27810598596722, which contains 22 as substring.

It is an Ulam 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 (3728983) 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, 4541 + ... + 5298.

It is an arithmetic number, because the mean of its divisors is an integer number (934800).

Almost surely, 2^3728981 is an apocalyptic number.

It is an amenable number.

3728981 is a deficient number, since it is larger than the sum of its proper divisors (10219).

3728981 is an equidigital number, since it uses as much as digits as its factorization.

3728981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10218.

The product of its digits is 24192, while the sum is 38.

The square root of 3728981 is about 1931.0569644627. The cubic root of 3728981 is about 155.0708105179.

The spelling of 3728981 in words is "three million, seven hundred twenty-eight thousand, nine hundred eighty-one".