39841965 has 24 divisors (see below), whose sum is σ = 73123128. Its totient is φ = 19998720.

The previous prime is 39841961. The next prime is 39841979. The reversal of 39841965 is 56914893.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 2056356 + 37785609 = 1434^2 + 6147^2 .

It is not a de Polignac number, because 39841965 - 2² = 39841961 is a prime.

It is a super-2 number, since 2×39841965² = 3174764350122450, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 39841965.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39841961) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 25276 + ... + 26805.

It is an arithmetic number, because the mean of its divisors is an integer number (3046797).

Almost surely, 2^39841965 is an apocalyptic number.

It is an amenable number.

39841965 is a deficient number, since it is larger than the sum of its proper divisors (33281163).

39841965 is a wasteful number, since it uses less digits than its factorization.

39841965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52109 (or 52106 counting only the distinct ones).

The product of its digits is 233280, while the sum is 45.

The square root of 39841965 is about 6312.0491918235. The cubic root of 39841965 is about 341.5442014661.

The spelling of 39841965 in words is "thirty-nine million, eight hundred forty-one thousand, nine hundred sixty-five".