7865438 has 16 divisors (see below), whose sum is σ = 13949280. Its totient is φ = 3254496.

The previous prime is 7865393. The next prime is 7865443. The reversal of 7865438 is 8345687.

It is a happy number.

It is a super-2 number, since 2×7865438² = 123730229863688, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 7865395 and 7865404.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9281 + ... + 10092.

It is an arithmetic number, because the mean of its divisors is an integer number (871830).

Almost surely, 2^7865438 is an apocalyptic number.

7865438 is a deficient number, since it is larger than the sum of its proper divisors (6083842).

7865438 is a wasteful number, since it uses less digits than its factorization.

7865438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19411.

The product of its digits is 161280, while the sum is 41.

The square root of 7865438 is about 2804.5388212681. The cubic root of 7865438 is about 198.8723034533.

Subtracting 7865438 from its reverse (8345687), we obtain a square (480249 = 693²).

The spelling of 7865438 in words is "seven million, eight hundred sixty-five thousand, four hundred thirty-eight".