39440869 has 4 divisors (see below), whose sum is σ = 42474796. Its totient is φ = 36406944.

The previous prime is 39440857. The next prime is 39440873. The reversal of 39440869 is 96804493.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 96804493 = 23 ⋅4208891.

It can be written as a sum of positive squares in 2 ways, for example, as 3560769 + 35880100 = 1887^2 + 5990^2 .

It is a cyclic number.

It is not a de Polignac number, because 39440869 - 2¹¹ = 39438821 is a prime.

It is a super-2 number, since 2×39440869² = 3111164294950322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39440069) 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, 1516944 + ... + 1516969.

It is an arithmetic number, because the mean of its divisors is an integer number (10618699).

Almost surely, 2^39440869 is an apocalyptic number.

It is an amenable number.

39440869 is a deficient number, since it is larger than the sum of its proper divisors (3033927).

39440869 is a wasteful number, since it uses less digits than its factorization.

39440869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3033926.

The product of its (nonzero) digits is 186624, while the sum is 43.

The square root of 39440869 is about 6280.1965733566. The cubic root of 39440869 is about 340.3942054005.

The spelling of 39440869 in words is "thirty-nine million, four hundred forty thousand, eight hundred sixty-nine".