40731261 has 8 divisors (see below), whose sum is σ = 54409824. Its totient is φ = 27103440.

The previous prime is 40731239. The next prime is 40731287. The reversal of 40731261 is 16213704.

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

It is not a de Polignac number, because 40731261 - 2²² = 36536957 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40731211) 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, 10770 + ... + 14051.

It is an arithmetic number, because the mean of its divisors is an integer number (6801228).

Almost surely, 2^40731261 is an apocalyptic number.

It is an amenable number.

40731261 is a deficient number, since it is larger than the sum of its proper divisors (13678563).

40731261 is a wasteful number, since it uses less digits than its factorization.

40731261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25371.

The product of its (nonzero) digits is 1008, while the sum is 24.

The square root of 40731261 is about 6382.1047468684. The cubic root of 40731261 is about 344.0666813453.

Adding to 40731261 its reverse (16213704), we get a palindrome (56944965).

The spelling of 40731261 in words is "forty million, seven hundred thirty-one thousand, two hundred sixty-one".