40007261 has 4 divisors (see below), whose sum is σ = 45722592. Its totient is φ = 34291932.

The previous prime is 40007257. The next prime is 40007263. The reversal of 40007261 is 16270004.

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 40007261 - 2² = 40007257 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40007263) 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, 2857655 + ... + 2857668.

It is an arithmetic number, because the mean of its divisors is an integer number (11430648).

Almost surely, 2^40007261 is an apocalyptic number.

It is an amenable number.

40007261 is a deficient number, since it is larger than the sum of its proper divisors (5715331).

40007261 is an equidigital number, since it uses as much as digits as its factorization.

40007261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5715330.

The product of its (nonzero) digits is 336, while the sum is 20.

The square root of 40007261 is about 6325.1293267411. The cubic root of 40007261 is about 342.0158816422.

Adding to 40007261 its reverse (16270004), we get a palindrome (56277265).

The spelling of 40007261 in words is "forty million, seven thousand, two hundred sixty-one".