7879540 has 12 divisors (see below), whose sum is σ = 16547076. Its totient is φ = 3151808.

The previous prime is 7879537. The next prime is 7879541. The reversal of 7879540 is 459787.

It can be written as a sum of positive squares in 2 ways, for example, as 5143824 + 2735716 = 2268^2 + 1654^2 .

It is a super-2 number, since 2×7879540² = 124174301223200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 7879493 and 7879502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7879541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 196969 + ... + 197008.

It is an arithmetic number, because the mean of its divisors is an integer number (1378923).

Almost surely, 2^7879540 is an apocalyptic number.

It is an amenable number.

7879540 is an abundant number, since it is smaller than the sum of its proper divisors (8667536).

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

7879540 is a wasteful number, since it uses less digits than its factorization.

7879540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 393986 (or 393984 counting only the distinct ones).

The product of its (nonzero) digits is 70560, while the sum is 40.

The square root of 7879540 is about 2807.0518342204. The cubic root of 7879540 is about 198.9910856844.

The spelling of 7879540 in words is "seven million, eight hundred seventy-nine thousand, five hundred forty".