39972061 has 2 divisors, whose sum is σ = 39972062. Its totient is φ = 39972060.

The previous prime is 39972059. The next prime is 39972073. The reversal of 39972061 is 16027993.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 35105625 + 4866436 = 5925^2 + 2206^2 .

It is a cyclic number.

It is not a de Polignac number, because 39972061 - 2¹ = 39972059 is a prime.

Together with 39972059, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 39972061.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (39972461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19986030 + 19986031.

It is an arithmetic number, because the mean of its divisors is an integer number (19986031).

Almost surely, 2^39972061 is an apocalyptic number.

It is an amenable number.

39972061 is a deficient number, since it is larger than the sum of its proper divisors (1).

39972061 is an equidigital number, since it uses as much as digits as its factorization.

39972061 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20412, while the sum is 37.

The square root of 39972061 is about 6322.3461626203. The cubic root of 39972061 is about 341.9155457595.

The spelling of 39972061 in words is "thirty-nine million, nine hundred seventy-two thousand, sixty-one".