39840481 has 4 divisors (see below), whose sum is σ = 40206100. Its totient is φ = 39474864.

The previous prime is 39840467. The next prime is 39840529. The reversal of 39840481 is 18404893.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 18533025 + 21307456 = 4305^2 + 4616^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-39840481 is a prime.

It is a super-2 number, since 2×39840481² = 3174527852622722, which contains 22 as substring.

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 39840481.

It is not an unprimeable number, because it can be changed into a prime (39840181) 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, 182646 + ... + 182863.

It is an arithmetic number, because the mean of its divisors is an integer number (10051525).

Almost surely, 2^39840481 is an apocalyptic number.

It is an amenable number.

39840481 is a deficient number, since it is larger than the sum of its proper divisors (365619).

39840481 is a wasteful number, since it uses less digits than its factorization.

39840481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 365618.

The product of its (nonzero) digits is 27648, while the sum is 37.

The square root of 39840481 is about 6311.9316377794. The cubic root of 39840481 is about 341.5399608964.

The spelling of 39840481 in words is "thirty-nine million, eight hundred forty thousand, four hundred eighty-one".