7121853 has 6 divisors (see below), whose sum is σ = 10287134. Its totient is φ = 4747896.

The previous prime is 7121839. The next prime is 7121867. The reversal of 7121853 is 3581217.

It is an interprime number because it is at equal distance from previous prime (7121839) and next prime (7121867).

It can be written as a sum of positive squares in only one way, i.e., 6563844 + 558009 = 2562^2 + 747^2 .

It is not a de Polignac number, because 7121853 - 2⁹ = 7121341 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 (7121833) 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, 395650 + ... + 395667.

Almost surely, 2^7121853 is an apocalyptic number.

It is an amenable number.

7121853 is a deficient number, since it is larger than the sum of its proper divisors (3165281).

7121853 is a wasteful number, since it uses less digits than its factorization.

7121853 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 791323 (or 791320 counting only the distinct ones).

The product of its digits is 1680, while the sum is 27.

The square root of 7121853 is about 2668.6800107919. The cubic root of 7121853 is about 192.3967220221.

The spelling of 7121853 in words is "seven million, one hundred twenty-one thousand, eight hundred fifty-three".