7129985 has 16 divisors (see below), whose sum is σ = 8822352. Its totient is φ = 5529600.

The previous prime is 7129877. The next prime is 7130003. The reversal of 7129985 is 5899217.

It can be written as a sum of positive squares in 8 ways, for example, as 494209 + 6635776 = 703^2 + 2576^2 .

It is not a de Polignac number, because 7129985 - 2⁸ = 7129729 is a prime.

It is a super-2 number, since 2×7129985² = 101673372200450, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29465 + ... + 29705.

It is an arithmetic number, because the mean of its divisors is an integer number (551397).

Almost surely, 2^7129985 is an apocalyptic number.

It is an amenable number.

7129985 is a deficient number, since it is larger than the sum of its proper divisors (1692367).

7129985 is a wasteful number, since it uses less digits than its factorization.

7129985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 404.

The product of its digits is 45360, while the sum is 41.

The square root of 7129985 is about 2670.2031757902. The cubic root of 7129985 is about 192.4699227759.

The spelling of 7129985 in words is "seven million, one hundred twenty-nine thousand, nine hundred eighty-five".