40087129 has 2 divisors, whose sum is σ = 40087130. Its totient is φ = 40087128.

The previous prime is 40087127. The next prime is 40087219. The reversal of 40087129 is 92178004.

Together with next prime (40087219) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22781529 + 17305600 = 4773^2 + 4160^2 .

It is a cyclic number.

It is not a de Polignac number, because 40087129 - 2¹ = 40087127 is a prime.

It is a super-2 number, since 2×40087129² = 3213955822925282, which contains 22 as substring.

Together with 40087127, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 40087129.

It is not a weakly prime, because it can be changed into another prime (40087121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20043564 + 20043565.

It is an arithmetic number, because the mean of its divisors is an integer number (20043565).

Almost surely, 2^40087129 is an apocalyptic number.

It is an amenable number.

40087129 is a deficient number, since it is larger than the sum of its proper divisors (1).

40087129 is an equidigital number, since it uses as much as digits as its factorization.

40087129 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4032, while the sum is 31.

The square root of 40087129 is about 6331.4397256864. The cubic root of 40087129 is about 342.2433234156.

The spelling of 40087129 in words is "forty million, eighty-seven thousand, one hundred twenty-nine".