1994069018 has 4 divisors (see below), whose sum is σ = 2991103530. Its totient is φ = 997034508.

The previous prime is 1994069003. The next prime is 1994069023. The reversal of 1994069018 is 8109604991.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8109604991 = 31 ⋅261600161.

It can be written as a sum of positive squares in only one way, i.e., 1391513809 + 602555209 = 37303^2 + 24547^2 .

It is a super-2 number, since 2×1994069018² = 7952622497094968648, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 498517253 + ... + 498517256.

Almost surely, 2^1994069018 is an apocalyptic number.

1994069018 is a deficient number, since it is larger than the sum of its proper divisors (997034512).

1994069018 is an equidigital number, since it uses as much as digits as its factorization.

1994069018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 997034511.

The product of its (nonzero) digits is 139968, while the sum is 47.

The square root of 1994069018 is about 44654.9999216213. Note that the first 4 decimals coincide. The cubic root of 1994069018 is about 1258.6743885825.

The spelling of 1994069018 in words is "one billion, nine hundred ninety-four million, sixty-nine thousand, eighteen".