3801981 has 8 divisors (see below), whose sum is σ = 5130720. Its totient is φ = 2503952.

The previous prime is 3801977. The next prime is 3801983. The reversal of 3801981 is 1891083.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 3801981 - 2² = 3801977 is a prime.

It is a super-2 number, since 2×3801981² = 28910119048722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3801983) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7386 + ... + 7883.

It is an arithmetic number, because the mean of its divisors is an integer number (641340).

Almost surely, 2^3801981 is an apocalyptic number.

It is an amenable number.

3801981 is a deficient number, since it is larger than the sum of its proper divisors (1328739).

3801981 is a wasteful number, since it uses less digits than its factorization.

3801981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15355.

The product of its (nonzero) digits is 1728, while the sum is 30.

The square root of 3801981 is about 1949.8669185357. The cubic root of 3801981 is about 156.0761873089.

The spelling of 3801981 in words is "three million, eight hundred one thousand, nine hundred eighty-one".