39801 has 4 divisors (see below), whose sum is σ = 53072. Its totient is φ = 26532.

The previous prime is 39799. The next prime is 39821. The reversal of 39801 is 10893.

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: 10893 = 3 ⋅3631.

It is not a de Polignac number, because 39801 - 2¹ = 39799 is a prime.

It is a D-number.

It is the 200-th Hogben number.

It is a Duffinian number.

39801 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (39821) by changing a digit.

It is a nontrivial repunit in base 199.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6631 + ... + 6636.

It is an arithmetic number, because the mean of its divisors is an integer number (13268).

2³⁹⁸⁰¹ is an apocalyptic number.

It is an amenable number.

39801 is a deficient number, since it is larger than the sum of its proper divisors (13271).

39801 is a wasteful number, since it uses less digits than its factorization.

39801 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13270.

The product of its (nonzero) digits is 216, while the sum is 21.

The square root of 39801 is about 199.5018796904. The cubic root of 39801 is about 34.1427104194.

It can be divided in two parts, 3 and 9801, that multiplied together give a triangular number (29403 = T₂₄₂).

The spelling of 39801 in words is "thirty-nine thousand, eight hundred one".