7212861 has 8 divisors (see below), whose sum is σ = 10685760. Its totient is φ = 4808556.

The previous prime is 7212859. The next prime is 7212871. The reversal of 7212861 is 1682127.

It is not a de Polignac number, because 7212861 - 2¹ = 7212859 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 267143 = 7212861 / (7 + 2 + 1 + 2 + 8 + 6 + 1).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7212841) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 133545 + ... + 133598.

It is an arithmetic number, because the mean of its divisors is an integer number (1335720).

Almost surely, 2^7212861 is an apocalyptic number.

It is an amenable number.

7212861 is a deficient number, since it is larger than the sum of its proper divisors (3472899).

7212861 is a wasteful number, since it uses less digits than its factorization.

7212861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 267152 (or 267146 counting only the distinct ones).

The product of its digits is 1344, while the sum is 27.

The square root of 7212861 is about 2685.6770096197. The cubic root of 7212861 is about 193.2127822259.

Adding to 7212861 its reverse (1682127), we get a palindrome (8894988).

The spelling of 7212861 in words is "seven million, two hundred twelve thousand, eight hundred sixty-one".