89439509 has 6 divisors (see below), whose sum is σ = 92630850. Its totient is φ = 86354576.

The previous prime is 89439487. The next prime is 89439523. The reversal of 89439509 is 90593498.

It can be written as a sum of positive squares in 3 ways, for example, as 18037009 + 71402500 = 4247^2 + 8450^2 .

It is not a de Polignac number, because 89439509 - 2⁸ = 89439253 is a prime.

It is a super-2 number, since 2×89439509² = 15998851540322162, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (89439599) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 52334 + ... + 54015.

It is an arithmetic number, because the mean of its divisors is an integer number (15438475).

Almost surely, 2^89439509 is an apocalyptic number.

It is an amenable number.

89439509 is a deficient number, since it is larger than the sum of its proper divisors (3191341).

89439509 is a wasteful number, since it uses less digits than its factorization.

89439509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106407 (or 106378 counting only the distinct ones).

The product of its (nonzero) digits is 349920, while the sum is 47.

The square root of 89439509 is about 9457.2463751348. The cubic root of 89439509 is about 447.2082452693.

The spelling of 89439509 in words is "eighty-nine million, four hundred thirty-nine thousand, five hundred nine".