18970879 has 4 divisors (see below), whose sum is σ = 19120384. Its totient is φ = 18821376.

The previous prime is 18970877. The next prime is 18970891. The reversal of 18970879 is 97807981.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 97807981 = 29 ⋅3372689.

It is a cyclic number.

It is not a de Polignac number, because 18970879 - 2¹ = 18970877 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 (18970877) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 74562 + ... + 74815.

It is an arithmetic number, because the mean of its divisors is an integer number (4780096).

Almost surely, 2^18970879 is an apocalyptic number.

18970879 is a deficient number, since it is larger than the sum of its proper divisors (149505).

18970879 is a wasteful number, since it uses less digits than its factorization.

18970879 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149504.

The product of its (nonzero) digits is 254016, while the sum is 49.

The square root of 18970879 is about 4355.5572548183. The cubic root of 18970879 is about 266.7037679281.

The spelling of 18970879 in words is "eighteen million, nine hundred seventy thousand, eight hundred seventy-nine".