40388281 has 4 divisors (see below), whose sum is σ = 42514000. Its totient is φ = 38262564.

The previous prime is 40388267. The next prime is 40388317. The reversal of 40388281 is 18288304.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 40388281 - 2⁹ = 40387769 is a prime.

It is a super-2 number, since 2×40388281² = 3262426484269922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40388261) 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, 1062831 + ... + 1062868.

It is an arithmetic number, because the mean of its divisors is an integer number (10628500).

Almost surely, 2^40388281 is an apocalyptic number.

It is an amenable number.

40388281 is a deficient number, since it is larger than the sum of its proper divisors (2125719).

40388281 is a wasteful number, since it uses less digits than its factorization.

40388281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2125718.

The product of its (nonzero) digits is 12288, while the sum is 34.

The square root of 40388281 is about 6355.1774955543. The cubic root of 40388281 is about 343.0982132543.

The spelling of 40388281 in words is "forty million, three hundred eighty-eight thousand, two hundred eighty-one".