7145857 has 4 divisors (see below), whose sum is σ = 7165696. Its totient is φ = 7126020.

The previous prime is 7145839. The next prime is 7145863. The reversal of 7145857 is 7585417.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7145857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7145867) 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, 9369 + ... + 10102.

It is an arithmetic number, because the mean of its divisors is an integer number (1791424).

Almost surely, 2^7145857 is an apocalyptic number.

It is an amenable number.

7145857 is a deficient number, since it is larger than the sum of its proper divisors (19839).

7145857 is a wasteful number, since it uses less digits than its factorization.

7145857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19838.

The product of its digits is 39200, while the sum is 37.

The square root of 7145857 is about 2673.1735820930. The cubic root of 7145857 is about 192.6126354931.

The spelling of 7145857 in words is "seven million, one hundred forty-five thousand, eight hundred fifty-seven".