40249987 has 4 divisors (see below), whose sum is σ = 41231736. Its totient is φ = 39268240.

The previous prime is 40249981. The next prime is 40250011. The reversal of 40249987 is 78994204.

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

It is a cyclic number.

It is not a de Polignac number, because 40249987 - 2¹¹ = 40247939 is a prime.

It is a super-2 number, since 2×40249987² = 3240122907000338, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40249981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 490813 + ... + 490894.

It is an arithmetic number, because the mean of its divisors is an integer number (10307934).

Almost surely, 2^40249987 is an apocalyptic number.

40249987 is a deficient number, since it is larger than the sum of its proper divisors (981749).

40249987 is an equidigital number, since it uses as much as digits as its factorization.

40249987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 981748.

The product of its (nonzero) digits is 145152, while the sum is 43.

The square root of 40249987 is about 6344.2877456811. The cubic root of 40249987 is about 342.7061631957.

The spelling of 40249987 in words is "forty million, two hundred forty-nine thousand, nine hundred eighty-seven".