39981001 has 4 divisors (see below), whose sum is σ = 40160512. Its totient is φ = 39801492.

The previous prime is 39980999. The next prime is 39981043. The reversal of 39981001 is 10018993.

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 a cyclic number.

It is not a de Polignac number, because 39981001 - 2¹ = 39980999 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (39981101) 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, 89421 + ... + 89866.

It is an arithmetic number, because the mean of its divisors is an integer number (10040128).

Almost surely, 2^39981001 is an apocalyptic number.

It is an amenable number.

39981001 is a deficient number, since it is larger than the sum of its proper divisors (179511).

39981001 is a wasteful number, since it uses less digits than its factorization.

39981001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 179510.

The product of its (nonzero) digits is 1944, while the sum is 31.

The square root of 39981001 is about 6323.0531391093. The cubic root of 39981001 is about 341.9410343720.

Adding to 39981001 its reverse (10018993), we get a palindrome (49999994).

The spelling of 39981001 in words is "thirty-nine million, nine hundred eighty-one thousand, one".