1994122278 has 24 divisors (see below), whose sum is σ = 4321790616. Its totient is φ = 664524000.

The previous prime is 1994122261. The next prime is 1994122283. The reversal of 1994122278 is 8722214991.

1994122278 is a `hidden beast` number, since 1 + 9 + 9 + 412 + 227 + 8 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 62433 + ... + 88803.

It is an arithmetic number, because the mean of its divisors is an integer number (180074609).

Almost surely, 2^1994122278 is an apocalyptic number.

1994122278 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1994122278 is an abundant number, since it is smaller than the sum of its proper divisors (2327668338).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1994122278 is a wasteful number, since it uses less digits than its factorization.

1994122278 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30580 (or 30577 counting only the distinct ones).

The product of its digits is 145152, while the sum is 45.

The square root of 1994122278 is about 44655.5962674333. The cubic root of 1994122278 is about 1258.6855945473.

The spelling of 1994122278 in words is "one billion, nine hundred ninety-four million, one hundred twenty-two thousand, two hundred seventy-eight".