39972101 has 4 divisors (see below), whose sum is σ = 43046892. Its totient is φ = 36897312.

The previous prime is 39972073. The next prime is 39972109. The reversal of 39972101 is 10127993.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 17181025 + 22791076 = 4145^2 + 4774^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-39972101 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39972109) 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, 1537376 + ... + 1537401.

It is an arithmetic number, because the mean of its divisors is an integer number (10761723).

Almost surely, 2^39972101 is an apocalyptic number.

It is an amenable number.

39972101 is a deficient number, since it is larger than the sum of its proper divisors (3074791).

39972101 is a wasteful number, since it uses less digits than its factorization.

39972101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3074790.

The product of its (nonzero) digits is 3402, while the sum is 32.

The square root of 39972101 is about 6322.3493260022. The cubic root of 39972101 is about 341.9156598110.

The spelling of 39972101 in words is "thirty-nine million, nine hundred seventy-two thousand, one hundred one".