7681438 has 4 divisors (see below), whose sum is σ = 11522160. Its totient is φ = 3840718.

The previous prime is 7681417. The next prime is 7681489. The reversal of 7681438 is 8341867.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8341867 = 103 ⋅80989.

It is a junction number, because it is equal to n+sod(n) for n = 7681397 and 7681406.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1920358 + ... + 1920361.

It is an arithmetic number, because the mean of its divisors is an integer number (2880540).

Almost surely, 2^7681438 is an apocalyptic number.

7681438 is a deficient number, since it is larger than the sum of its proper divisors (3840722).

7681438 is a wasteful number, since it uses less digits than its factorization.

7681438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3840721.

The product of its digits is 32256, while the sum is 37.

The square root of 7681438 is about 2771.5407267439. The cubic root of 7681438 is about 197.3092791119.

The spelling of 7681438 in words is "seven million, six hundred eighty-one thousand, four hundred thirty-eight".