4087639 has 2 divisors, whose sum is σ = 4087640. Its totient is φ = 4087638.

The previous prime is 4087631. The next prime is 4087661. The reversal of 4087639 is 9367804.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 4087639 - 2³ = 4087631 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 4087598 and 4087607.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4087631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2043819 + 2043820.

It is an arithmetic number, because the mean of its divisors is an integer number (2043820).

Almost surely, 2^4087639 is an apocalyptic number.

4087639 is a deficient number, since it is larger than the sum of its proper divisors (1).

4087639 is an equidigital number, since it uses as much as digits as its factorization.

4087639 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36288, while the sum is 37.

The square root of 4087639 is about 2021.7910376693. The cubic root of 4087639 is about 159.8910586530.

The spelling of 4087639 in words is "four million, eighty-seven thousand, six hundred thirty-nine".