40254581 has 8 divisors (see below), whose sum is σ = 41878200. Its totient is φ = 38646720.

The previous prime is 40254553. The next prime is 40254629. The reversal of 40254581 is 18545204.

It can be written as a sum of positive squares in 4 ways, for example, as 4553956 + 35700625 = 2134^2 + 5975^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 40254581 - 2¹⁸ = 39992437 is a prime.

It is a super-2 number, since 2×40254581² = 3240862582971122, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40254541) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1415 + ... + 9083.

It is an arithmetic number, because the mean of its divisors is an integer number (5234775).

Almost surely, 2^40254581 is an apocalyptic number.

It is an amenable number.

40254581 is a deficient number, since it is larger than the sum of its proper divisors (1623619).

40254581 is a wasteful number, since it uses less digits than its factorization.

40254581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7879.

The product of its (nonzero) digits is 6400, while the sum is 29.

The square root of 40254581 is about 6344.6497933298. The cubic root of 40254581 is about 342.7192011479.

Adding to 40254581 its reverse (18545204), we get a palindrome (58799785).

The spelling of 40254581 in words is "forty million, two hundred fifty-four thousand, five hundred eighty-one".