7861312 has 14 divisors (see below), whose sum is σ = 15599918. Its totient is φ = 3930624.

The previous prime is 7861309. The next prime is 7861319. The reversal of 7861312 is 2131687.

It can be written as a sum of positive squares in only one way, i.e., 7529536 + 331776 = 2744^2 + 576^2 .

It is a super-2 number, since 2×7861312² = 123600452722688, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (7861319) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61353 + ... + 61480.

Almost surely, 2^7861312 is an apocalyptic number.

It is an amenable number.

7861312 is a deficient number, since it is larger than the sum of its proper divisors (7738606).

7861312 is a wasteful number, since it uses less digits than its factorization.

7861312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122845 (or 122835 counting only the distinct ones).

The product of its digits is 2016, while the sum is 28.

The square root of 7861312 is about 2803.8031314627. The cubic root of 7861312 is about 198.8375229937.

Adding to 7861312 its reverse (2131687), we get a palindrome (9992999).

The spelling of 7861312 in words is "seven million, eight hundred sixty-one thousand, three hundred twelve".