39972543 has 16 divisors (see below), whose sum is σ = 58949856. Its totient is φ = 23932800.

The previous prime is 39972529. The next prime is 39972557. The reversal of 39972543 is 34527993.

It is an interprime number because it is at equal distance from previous prime (39972529) and next prime (39972557).

It is not a de Polignac number, because 39972543 - 2¹⁷ = 39841471 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 39972495 and 39972504.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39972563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12408 + ... + 15293.

It is an arithmetic number, because the mean of its divisors is an integer number (3684366).

Almost surely, 2^39972543 is an apocalyptic number.

39972543 is a deficient number, since it is larger than the sum of its proper divisors (18977313).

39972543 is a wasteful number, since it uses less digits than its factorization.

39972543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27754.

The product of its digits is 204120, while the sum is 42.

The square root of 39972543 is about 6322.3842812660. The cubic root of 39972543 is about 341.9169200747.

The spelling of 39972543 in words is "thirty-nine million, nine hundred seventy-two thousand, five hundred forty-three".