39872029 has 4 divisors (see below), whose sum is σ = 39900960. Its totient is φ = 39843100.

The previous prime is 39872017. The next prime is 39872039. The reversal of 39872029 is 92027893.

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: 92027893 = 131 ⋅702503.

It is a cyclic number.

It is not a de Polignac number, because 39872029 - 2¹⁷ = 39740957 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 39871982 and 39872000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39872039) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12289 + ... + 15190.

It is an arithmetic number, because the mean of its divisors is an integer number (9975240).

Almost surely, 2^39872029 is an apocalyptic number.

It is an amenable number.

39872029 is a deficient number, since it is larger than the sum of its proper divisors (28931).

39872029 is a wasteful number, since it uses less digits than its factorization.

39872029 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28930.

The product of its (nonzero) digits is 54432, while the sum is 40.

The square root of 39872029 is about 6314.4302197427. The cubic root of 39872029 is about 341.6300874846.

It can be divided in two parts, 398 and 72029, that added together give a palindrome (72427).

The spelling of 39872029 in words is "thirty-nine million, eight hundred seventy-two thousand, twenty-nine".