1994920409 has 12 divisors (see below), whose sum is σ = 2109204240. Its totient is φ = 1881601200.

The previous prime is 1994920397. The next prime is 1994920427. The reversal of 1994920409 is 9040294991.

It is a de Polignac number, because none of the positive numbers 2^k-1994920409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1994920429) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1374134 + ... + 1375584.

It is an arithmetic number, because the mean of its divisors is an integer number (175767020).

Almost surely, 2^1994920409 is an apocalyptic number.

1994920409 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

1994920409 is a deficient number, since it is larger than the sum of its proper divisors (114283831).

1994920409 is an equidigital number, since it uses as much as digits as its factorization.

1994920409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2008 (or 1739 counting only the distinct ones).

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

The square root of 1994920409 is about 44664.5318905281. The cubic root of 1994920409 is about 1258.8534983256.

The spelling of 1994920409 in words is "one billion, nine hundred ninety-four million, nine hundred twenty thousand, four hundred nine".