40009281 has 16 divisors (see below), whose sum is σ = 58262400. Its totient is φ = 24272640.

The previous prime is 40009273. The next prime is 40009283. The reversal of 40009281 is 18290004.

It is not a de Polignac number, because 40009281 - 2³ = 40009273 is a prime.

It is a super-2 number, since 2×40009281² = 3201485132273922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (40009283) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4456 + ... + 9993.

It is an arithmetic number, because the mean of its divisors is an integer number (3641400).

Almost surely, 2^40009281 is an apocalyptic number.

It is an amenable number.

40009281 is a deficient number, since it is larger than the sum of its proper divisors (18253119).

40009281 is a wasteful number, since it uses less digits than its factorization.

40009281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14536.

The product of its (nonzero) digits is 576, while the sum is 24.

The square root of 40009281 is about 6325.2890052550. The cubic root of 40009281 is about 342.0216377678.

Adding to 40009281 its reverse (18290004), we get a palindrome (58299285).

The spelling of 40009281 in words is "forty million, nine thousand, two hundred eighty-one".