40667281 has 4 divisors (see below), whose sum is σ = 43059492. Its totient is φ = 38275072.

The previous prime is 40667269. The next prime is 40667299. The reversal of 40667281 is 18276604.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 28998225 + 11669056 = 5385^2 + 3416^2 .

It is a cyclic number.

It is not a de Polignac number, because 40667281 - 2²⁵ = 7112849 is a prime.

It is a super-2 number, since 2×40667281² = 3307655487865922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40661281) 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, 1196080 + ... + 1196113.

It is an arithmetic number, because the mean of its divisors is an integer number (10764873).

Almost surely, 2^40667281 is an apocalyptic number.

It is an amenable number.

40667281 is a deficient number, since it is larger than the sum of its proper divisors (2392211).

40667281 is a wasteful number, since it uses less digits than its factorization.

40667281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2392210.

The product of its (nonzero) digits is 16128, while the sum is 34.

The square root of 40667281 is about 6377.0903239644. The cubic root of 40667281 is about 343.8864354940.

The spelling of 40667281 in words is "forty million, six hundred sixty-seven thousand, two hundred eighty-one".