18970838 has 4 divisors (see below), whose sum is σ = 28456260. Its totient is φ = 9485418.

The previous prime is 18970811. The next prime is 18970841. The reversal of 18970838 is 83807981.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 83807981 = 971 ⋅86311.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4742708 + ... + 4742711.

It is an arithmetic number, because the mean of its divisors is an integer number (7114065).

Almost surely, 2^18970838 is an apocalyptic number.

18970838 is a deficient number, since it is larger than the sum of its proper divisors (9485422).

18970838 is an equidigital number, since it uses as much as digits as its factorization.

18970838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9485421.

The product of its (nonzero) digits is 96768, while the sum is 44.

The square root of 18970838 is about 4355.5525481849. The cubic root of 18970838 is about 266.7035757940.

The spelling of 18970838 in words is "eighteen million, nine hundred seventy thousand, eight hundred thirty-eight".