40487639 has 4 divisors (see below), whose sum is σ = 41429256. Its totient is φ = 39546024.

The previous prime is 40487627. The next prime is 40487663. The reversal of 40487639 is 93678404.

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 40487639 - 2¹² = 40483543 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 40487596 and 40487605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40487339) 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, 470744 + ... + 470829.

It is an arithmetic number, because the mean of its divisors is an integer number (10357314).

Almost surely, 2^40487639 is an apocalyptic number.

40487639 is a deficient number, since it is larger than the sum of its proper divisors (941617).

40487639 is an equidigital number, since it uses as much as digits as its factorization.

40487639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 941616.

The product of its (nonzero) digits is 145152, while the sum is 41.

The square root of 40487639 is about 6362.9897846846. The cubic root of 40487639 is about 343.3793314017.

The spelling of 40487639 in words is "forty million, four hundred eighty-seven thousand, six hundred thirty-nine".