7791438 has 8 divisors (see below), whose sum is σ = 15582888. Its totient is φ = 2597144.

The previous prime is 7791437. The next prime is 7791451. The reversal of 7791438 is 8341977.

It is a sphenic number, since it is the product of 3 distinct primes.

7791438 is an admirable number.

It is a super-2 number, since 2×7791438² = 121413012215688, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 7791396 and 7791405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7791431) 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, 649281 + ... + 649292.

It is an arithmetic number, because the mean of its divisors is an integer number (1947861).

Almost surely, 2^7791438 is an apocalyptic number.

7791438 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

7791438 is a wasteful number, since it uses less digits than its factorization.

7791438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1298578.

The product of its digits is 42336, while the sum is 39.

The square root of 7791438 is about 2791.3147439871. The cubic root of 7791438 is about 198.2466571963.

The spelling of 7791438 in words is "seven million, seven hundred ninety-one thousand, four hundred thirty-eight".