1994920489 has 4 divisors (see below), whose sum is σ = 1997424324. Its totient is φ = 1992416656.

The previous prime is 1994920481. The next prime is 1994920513. The reversal of 1994920489 is 9840294991.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1116094464 + 878826025 = 33408^2 + 29645^2 .

It is a cyclic number.

It is not a de Polignac number, because 1994920489 - 2³ = 1994920481 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1994920481) 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, 1250722 + ... + 1252315.

It is an arithmetic number, because the mean of its divisors is an integer number (499356081).

Almost surely, 2^1994920489 is an apocalyptic number.

It is an amenable number.

1994920489 is a deficient number, since it is larger than the sum of its proper divisors (2503835).

1994920489 is an equidigital number, since it uses as much as digits as its factorization.

1994920489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2503834.

The product of its (nonzero) digits is 1679616, while the sum is 55.

The square root of 1994920489 is about 44664.5327860933. The cubic root of 1994920489 is about 1258.8535151531.

The spelling of 1994920489 in words is "one billion, nine hundred ninety-four million, nine hundred twenty thousand, four hundred eighty-nine".