7981869 has 16 divisors (see below), whose sum is σ = 12423168. Its totient is φ = 4463472.

The previous prime is 7981867. The next prime is 7981871. The reversal of 7981869 is 9681897.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (7981867) and next prime (7981871).

It is not a de Polignac number, because 7981869 - 2¹ = 7981867 is a prime.

It is a super-2 number, since 2×7981869² = 127420465466322, which contains 22 as substring.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7981867) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3057 + ... + 5030.

It is an arithmetic number, because the mean of its divisors is an integer number (776448).

Almost surely, 2^7981869 is an apocalyptic number.

It is an amenable number.

7981869 is a deficient number, since it is larger than the sum of its proper divisors (4441299).

7981869 is a wasteful number, since it uses less digits than its factorization.

7981869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8144.

The product of its digits is 217728, while the sum is 48.

The square root of 7981869 is about 2825.2201684117. The cubic root of 7981869 is about 199.8487940459.

The spelling of 7981869 in words is "seven million, nine hundred eighty-one thousand, eight hundred sixty-nine".