1993447491 has 32 divisors (see below), whose sum is σ = 3200386560. Its totient is φ = 1078189056.

The previous prime is 1993447471. The next prime is 1993447493. The reversal of 1993447491 is 1947443991.

It is a de Polignac number, because none of the positive numbers 2^k-1993447491 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1993447493) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 803545 + ... + 806021.

It is an arithmetic number, because the mean of its divisors is an integer number (100012080).

Almost surely, 2^1993447491 is an apocalyptic number.

1993447491 is a deficient number, since it is larger than the sum of its proper divisors (1206939069).

1993447491 is a wasteful number, since it uses less digits than its factorization.

1993447491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4523.

The product of its digits is 979776, while the sum is 51.

The square root of 1993447491 is about 44648.0401697544. The cubic root of 1993447491 is about 1258.5436038401.

The spelling of 1993447491 in words is "one billion, nine hundred ninety-three million, four hundred forty-seven thousand, four hundred ninety-one".