18970993 has 6 divisors (see below), whose sum is σ = 19161506. Its totient is φ = 18782352.

The previous prime is 18970967. The next prime is 18971003. The reversal of 18970993 is 39907981.

It can be written as a sum of positive squares in only one way, i.e., 14837904 + 4133089 = 3852^2 + 2033^2 .

It is not a de Polignac number, because 18970993 - 2⁵ = 18970961 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18970933) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 10621 + ... + 12277.

Almost surely, 2^18970993 is an apocalyptic number.

It is an amenable number.

18970993 is a deficient number, since it is larger than the sum of its proper divisors (190513).

18970993 is an equidigital number, since it uses as much as digits as its factorization.

18970993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1871 (or 1764 counting only the distinct ones).

The product of its (nonzero) digits is 122472, while the sum is 46.

The square root of 18970993 is about 4355.5703415282. The cubic root of 18970993 is about 266.7043021534.

The spelling of 18970993 in words is "eighteen million, nine hundred seventy thousand, nine hundred ninety-three".