40001281 has 8 divisors (see below), whose sum is σ = 41277600. Its totient is φ = 38739360.

The previous prime is 40001267. The next prime is 40001287. The reversal of 40001281 is 18210004.

It is a happy number.

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 40001281 - 2⁵ = 40001249 is a prime.

It is a super-2 number, since 2×40001281² = 3200204963281922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40001287) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2190 + ... + 9208.

It is an arithmetic number, because the mean of its divisors is an integer number (5159700).

Almost surely, 2^40001281 is an apocalyptic number.

40001281 is a gapful number since it is divisible by the number (41) formed by its first and last digit.

It is an amenable number.

40001281 is a deficient number, since it is larger than the sum of its proper divisors (1276319).

40001281 is a wasteful number, since it uses less digits than its factorization.

40001281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7199.

The product of its (nonzero) digits is 64, while the sum is 16.

The square root of 40001281 is about 6324.6565914680. The cubic root of 40001281 is about 341.9988400950.

Adding to 40001281 its reverse (18210004), we get a palindrome (58211285).

The spelling of 40001281 in words is "forty million, one thousand, two hundred eighty-one".