39940169 has 4 divisors (see below), whose sum is σ = 39952896. Its totient is φ = 39927444.

The previous prime is 39940151. The next prime is 39940171. The reversal of 39940169 is 96104993.

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 a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 96104993 = 167 ⋅575479.

It is a cyclic number.

It is not a de Polignac number, because 39940169 - 2¹⁶ = 39874633 is a prime.

It is a super-2 number, since 2×39940169² = 3190434199497122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (39940129) 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, 2072 + ... + 9174.

It is an arithmetic number, because the mean of its divisors is an integer number (9988224).

Almost surely, 2^39940169 is an apocalyptic number.

It is an amenable number.

39940169 is a deficient number, since it is larger than the sum of its proper divisors (12727).

39940169 is an equidigital number, since it uses as much as digits as its factorization.

39940169 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12726.

The product of its (nonzero) digits is 52488, while the sum is 41.

The square root of 39940169 is about 6319.8234943707. The cubic root of 39940169 is about 341.8245882953.

The spelling of 39940169 in words is "thirty-nine million, nine hundred forty thousand, one hundred sixty-nine".