7149805 has 16 divisors (see below), whose sum is σ = 9560880. Its totient is φ = 5096448.

The previous prime is 7149799. The next prime is 7149811. The reversal of 7149805 is 5089417.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (7149799) and next prime (7149811).

It can be written as a sum of positive squares in 8 ways, for example, as 1225449 + 5924356 = 1107^2 + 2434^2 .

It is a cyclic number.

It is not a de Polignac number, because 7149805 - 2⁷ = 7149677 is a prime.

It is a super-2 number, since 2×7149805² = 102239423076050, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12 + ... + 3781.

It is an arithmetic number, because the mean of its divisors is an integer number (597555).

Almost surely, 2^7149805 is an apocalyptic number.

It is an amenable number.

7149805 is a deficient number, since it is larger than the sum of its proper divisors (2411075).

7149805 is a wasteful number, since it uses less digits than its factorization.

7149805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3840.

The product of its (nonzero) digits is 10080, while the sum is 34.

The square root of 7149805 is about 2673.9119282430. The cubic root of 7149805 is about 192.6481010169.

The spelling of 7149805 in words is "seven million, one hundred forty-nine thousand, eight hundred five".