1989647037 has 64 divisors (see below), whose sum is σ = 3583180800. Its totient is φ = 1065173760.

The previous prime is 1989647021. The next prime is 1989647081. The reversal of 1989647037 is 7307469891.

It is a happy number.

It is not a de Polignac number, because 1989647037 - 2⁴ = 1989647021 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1989647017) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 766612 + ... + 769202.

It is an arithmetic number, because the mean of its divisors is an integer number (55987200).

Almost surely, 2^1989647037 is an apocalyptic number.

1989647037 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

1989647037 is a deficient number, since it is larger than the sum of its proper divisors (1593533763).

1989647037 is a wasteful number, since it uses less digits than its factorization.

1989647037 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2863 (or 2857 counting only the distinct ones).

The product of its (nonzero) digits is 2286144, while the sum is 54.

The square root of 1989647037 is about 44605.4597218771. The cubic root of 1989647037 is about 1257.7433018682.

The spelling of 1989647037 in words is "one billion, nine hundred eighty-nine million, six hundred forty-seven thousand, thirty-seven".