1994263921 has 16 divisors (see below), whose sum is σ = 2359002240. Its totient is φ = 1668142080.

The previous prime is 1994263919. The next prime is 1994263939. The reversal of 1994263921 is 1293624991.

It is a cyclic number.

It is not a de Polignac number, because 1994263921 - 2¹ = 1994263919 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1994263981) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 169840 + ... + 181201.

It is an arithmetic number, because the mean of its divisors is an integer number (147437640).

Almost surely, 2^1994263921 is an apocalyptic number.

It is an amenable number.

1994263921 is a deficient number, since it is larger than the sum of its proper divisors (364738319).

1994263921 is a wasteful number, since it uses less digits than its factorization.

1994263921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 351096.

The product of its digits is 209952, while the sum is 46.

The square root of 1994263921 is about 44657.1821883110. The cubic root of 1994263921 is about 1258.7153954250.

The spelling of 1994263921 in words is "one billion, nine hundred ninety-four million, two hundred sixty-three thousand, nine hundred twenty-one".