7878749 has 16 divisors (see below), whose sum is σ = 8736000. Its totient is φ = 7076160.

The previous prime is 7878721. The next prime is 7878763. The reversal of 7878749 is 9478787.

It is a cyclic number.

It is not a de Polignac number, because 7878749 - 2¹² = 7874653 is a prime.

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

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 7878697 and 7878706.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7878709) 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, 43439 + ... + 43619.

It is an arithmetic number, because the mean of its divisors is an integer number (546000).

Almost surely, 2^7878749 is an apocalyptic number.

7878749 is a gapful number since it is divisible by the number (79) formed by its first and last digit.

It is an amenable number.

7878749 is a deficient number, since it is larger than the sum of its proper divisors (857251).

7878749 is a wasteful number, since it uses less digits than its factorization.

7878749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 308.

The product of its digits is 790272, while the sum is 50.

The square root of 7878749 is about 2806.9109355304. The cubic root of 7878749 is about 198.9844267840.

The spelling of 7878749 in words is "seven million, eight hundred seventy-eight thousand, seven hundred forty-nine".