87742939 has 4 divisors (see below), whose sum is σ = 87766624. Its totient is φ = 87719256.

The previous prime is 87742913. The next prime is 87742943. The reversal of 87742939 is 93924778.

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 87742939 - 2¹⁵ = 87710171 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 87742892 and 87742901.

It is not an unprimeable number, because it can be changed into a prime (87749939) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4947 + ... + 14140.

It is an arithmetic number, because the mean of its divisors is an integer number (21941656).

Almost surely, 2^87742939 is an apocalyptic number.

87742939 is a deficient number, since it is larger than the sum of its proper divisors (23685).

87742939 is a wasteful number, since it uses less digits than its factorization.

87742939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23684.

The product of its digits is 762048, while the sum is 49.

The square root of 87742939 is about 9367.1201017175. The cubic root of 87742939 is about 444.3624907478.

The spelling of 87742939 in words is "eighty-seven million, seven hundred forty-two thousand, nine hundred thirty-nine".