39890811 has 4 divisors (see below), whose sum is σ = 53187752. Its totient is φ = 26593872.

The previous prime is 39890801. The next prime is 39890819. The reversal of 39890811 is 11809893.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11809893 = 3 ⋅3936631.

It is not a de Polignac number, because 39890811 - 2¹⁵ = 39858043 is a prime.

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 39890811.

It is not an unprimeable number, because it can be changed into a prime (39890819) 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, 6648466 + ... + 6648471.

It is an arithmetic number, because the mean of its divisors is an integer number (13296938).

Almost surely, 2^39890811 is an apocalyptic number.

39890811 is a deficient number, since it is larger than the sum of its proper divisors (13296941).

39890811 is a wasteful number, since it uses less digits than its factorization.

39890811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13296940.

The product of its (nonzero) digits is 15552, while the sum is 39.

The square root of 39890811 is about 6315.9172730491. The cubic root of 39890811 is about 341.6837214833.

The spelling of 39890811 in words is "thirty-nine million, eight hundred ninety thousand, eight hundred eleven".