93887989 has 4 divisors (see below), whose sum is σ = 101110156. Its totient is φ = 86665824.

The previous prime is 93887977. The next prime is 93888007. The reversal of 93887989 is 98978839.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 98978839 = 151 ⋅655489.

It can be written as a sum of positive squares in 2 ways, for example, as 43335889 + 50552100 = 6583^2 + 7110^2 .

It is a cyclic number.

It is not a de Polignac number, because 93887989 - 2⁷ = 93887861 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (93887929) 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, 3611064 + ... + 3611089.

It is an arithmetic number, because the mean of its divisors is an integer number (25277539).

Almost surely, 2^93887989 is an apocalyptic number.

It is an amenable number.

93887989 is a deficient number, since it is larger than the sum of its proper divisors (7222167).

93887989 is a wasteful number, since it uses less digits than its factorization.

93887989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7222166.

The product of its digits is 7838208, while the sum is 61.

The square root of 93887989 is about 9689.5814667095. The cubic root of 93887989 is about 454.5029213038.

The spelling of 93887989 in words is "ninety-three million, eight hundred eighty-seven thousand, nine hundred eighty-nine".