1994128265 has 8 divisors (see below), whose sum is σ = 2393203968. Its totient is φ = 1595135920.

The previous prime is 1994128259. The next prime is 1994128273. The reversal of 1994128265 is 5628214991.

It is a happy number.

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

It is not a de Polignac number, because 1994128265 - 2⁸ = 1994128009 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 61064 + ... + 87846.

It is an arithmetic number, because the mean of its divisors is an integer number (299150496).

Almost surely, 2^1994128265 is an apocalyptic number.

It is an amenable number.

1994128265 is a deficient number, since it is larger than the sum of its proper divisors (399075703).

1994128265 is a wasteful number, since it uses less digits than its factorization.

1994128265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41679.

The product of its digits is 311040, while the sum is 47.

The square root of 1994128265 is about 44655.6633026540. The cubic root of 1994128265 is about 1258.6868542064.

The spelling of 1994128265 in words is "one billion, nine hundred ninety-four million, one hundred twenty-eight thousand, two hundred sixty-five".