79867421 has 4 divisors (see below), whose sum is σ = 82621500. Its totient is φ = 77113344.

The previous prime is 79867409. The next prime is 79867433. The reversal of 79867421 is 12476897.

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

It is an interprime number because it is at equal distance from previous prime (79867409) and next prime (79867433).

It can be written as a sum of positive squares in 2 ways, for example, as 27825625 + 52041796 = 5275^2 + 7214^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-79867421 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79867441) 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, 1376996 + ... + 1377053.

It is an arithmetic number, because the mean of its divisors is an integer number (20655375).

Almost surely, 2^79867421 is an apocalyptic number.

It is an amenable number.

79867421 is a deficient number, since it is larger than the sum of its proper divisors (2754079).

79867421 is a wasteful number, since it uses less digits than its factorization.

79867421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2754078.

The product of its digits is 169344, while the sum is 44.

The square root of 79867421 is about 8936.8574454335. The cubic root of 79867421 is about 430.6487790653.

The spelling of 79867421 in words is "seventy-nine million, eight hundred sixty-seven thousand, four hundred twenty-one".