40187761 has 4 divisors (see below), whose sum is σ = 40443892. Its totient is φ = 39931632.

The previous prime is 40187747. The next prime is 40187783. The reversal of 40187761 is 16778104.

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 26460736 + 13727025 = 5144^2 + 3705^2 .

It is a cyclic number.

It is not a de Polignac number, because 40187761 - 2⁵ = 40187729 is a prime.

It is a super-2 number, since 2×40187761² = 3230112268386242, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40187701) 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, 127830 + ... + 128143.

It is an arithmetic number, because the mean of its divisors is an integer number (10110973).

Almost surely, 2^40187761 is an apocalyptic number.

It is an amenable number.

40187761 is a deficient number, since it is larger than the sum of its proper divisors (256131).

40187761 is a wasteful number, since it uses less digits than its factorization.

40187761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 256130.

The product of its (nonzero) digits is 9408, while the sum is 34.

The square root of 40187761 is about 6339.3817521900. The cubic root of 40187761 is about 342.5294655595.

The spelling of 40187761 in words is "forty million, one hundred eighty-seven thousand, seven hundred sixty-one".