7838945 has 4 divisors (see below), whose sum is σ = 9406740. Its totient is φ = 6271152.

The previous prime is 7838893. The next prime is 7838951. The reversal of 7838945 is 5498387.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2274064 + 5564881 = 1508^2 + 2359^2 .

It is a cyclic number.

It is not a de Polignac number, because 7838945 - 2⁸ = 7838689 is a prime.

It is a super-2 number, since 2×7838945² = 122898117426050, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is a junction number, because it is equal to n+sod(n) for n = 7838896 and 7838905.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 783890 + ... + 783899.

It is an arithmetic number, because the mean of its divisors is an integer number (2351685).

Almost surely, 2^7838945 is an apocalyptic number.

It is an amenable number.

7838945 is a deficient number, since it is larger than the sum of its proper divisors (1567795).

7838945 is a wasteful number, since it uses less digits than its factorization.

7838945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1567794.

The product of its digits is 241920, while the sum is 44.

The square root of 7838945 is about 2799.8116008046. The cubic root of 7838945 is about 198.6487663981.

The spelling of 7838945 in words is "seven million, eight hundred thirty-eight thousand, nine hundred forty-five".