1994139146 has 8 divisors (see below), whose sum is σ = 3121261344. Its totient is φ = 953718700.

The previous prime is 1994139143. The next prime is 1994139149. The reversal of 1994139146 is 6419314991.

It is an interprime number because it is at equal distance from previous prime (1994139143) and next prime (1994139149).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1994139146.

It is not an unprimeable number, because it can be changed into a prime (1994139143) 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, 21675380 + ... + 21675471.

It is an arithmetic number, because the mean of its divisors is an integer number (390157668).

Almost surely, 2^1994139146 is an apocalyptic number.

1994139146 is a deficient number, since it is larger than the sum of its proper divisors (1127122198).

1994139146 is a wasteful number, since it uses less digits than its factorization.

1994139146 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43350876.

The product of its digits is 209952, while the sum is 47.

The square root of 1994139146 is about 44655.7851347393. The cubic root of 1994139146 is about 1258.6891435521.

The spelling of 1994139146 in words is "one billion, nine hundred ninety-four million, one hundred thirty-nine thousand, one hundred forty-six".