39840499 has 4 divisors (see below), whose sum is σ = 40049280. Its totient is φ = 39631720.

The previous prime is 39840467. The next prime is 39840529. The reversal of 39840499 is 99404893.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 99404893 = 7 ⋅14200699.

It is a cyclic number.

It is not a de Polignac number, because 39840499 - 2⁵ = 39840467 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (39840599) 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, 104104 + ... + 104485.

It is an arithmetic number, because the mean of its divisors is an integer number (10012320).

Almost surely, 2^39840499 is an apocalyptic number.

39840499 is a deficient number, since it is larger than the sum of its proper divisors (208781).

39840499 is a wasteful number, since it uses less digits than its factorization.

39840499 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 208780.

The product of its (nonzero) digits is 279936, while the sum is 46.

The square root of 39840499 is about 6311.9330636502. The cubic root of 39840499 is about 341.5400123325.

The spelling of 39840499 in words is "thirty-nine million, eight hundred forty thousand, four hundred ninety-nine".