40297281 has 8 divisors (see below), whose sum is σ = 53761824. Its totient is φ = 26848800.

The previous prime is 40297277. The next prime is 40297289. The reversal of 40297281 is 18279204.

It is a happy number.

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

It is not a de Polignac number, because 40297281 - 2² = 40297277 is a prime.

It is a super-2 number, since 2×40297281² = 3247741711985922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (40297289) 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, 4306 + ... + 9956.

It is an arithmetic number, because the mean of its divisors is an integer number (6720228).

Almost surely, 2^40297281 is an apocalyptic number.

It is an amenable number.

40297281 is a deficient number, since it is larger than the sum of its proper divisors (13464543).

40297281 is a wasteful number, since it uses less digits than its factorization.

40297281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8031.

The product of its (nonzero) digits is 8064, while the sum is 33.

The square root of 40297281 is about 6348.0139413836. The cubic root of 40297281 is about 342.8403379908.

The spelling of 40297281 in words is "forty million, two hundred ninety-seven thousand, two hundred eighty-one".