39908161 has 4 divisors (see below), whose sum is σ = 39924400. Its totient is φ = 39891924.

The previous prime is 39908153. The next prime is 39908179. The reversal of 39908161 is 16180993.

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: 16180993 = 2551 ⋅6343.

It is a cyclic number.

It is not a de Polignac number, because 39908161 - 2³ = 39908153 is a prime.

It is a super-2 number, since 2×39908161² = 3185322628803842, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 39908161.

It is not an unprimeable number, because it can be changed into a prime (39908261) 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, 3591 + ... + 9628.

It is an arithmetic number, because the mean of its divisors is an integer number (9981100).

Almost surely, 2^39908161 is an apocalyptic number.

It is an amenable number.

39908161 is a deficient number, since it is larger than the sum of its proper divisors (16239).

39908161 is a wasteful number, since it uses less digits than its factorization.

39908161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16238.

The product of its (nonzero) digits is 11664, while the sum is 37.

The square root of 39908161 is about 6317.2906376072. The cubic root of 39908161 is about 341.7332512969.

The spelling of 39908161 in words is "thirty-nine million, nine hundred eight thousand, one hundred sixty-one".