1989742470 has 16 divisors (see below), whose sum is σ = 4775382000. Its totient is φ = 530597984.

The previous prime is 1989742463. The next prime is 1989742481. The reversal of 1989742470 is 742479891.

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33162345 + ... + 33162404.

It is an arithmetic number, because the mean of its divisors is an integer number (298461375).

Almost surely, 2^1989742470 is an apocalyptic number.

1989742470 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1989742470 is an abundant number, since it is smaller than the sum of its proper divisors (2785639530).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1989742470 is a wasteful number, since it uses less digits than its factorization.

1989742470 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66324759.

The product of its (nonzero) digits is 1016064, while the sum is 51.

The square root of 1989742470 is about 44606.5294547783. The cubic root of 1989742470 is about 1257.7634106773.

The spelling of 1989742470 in words is "one billion, nine hundred eighty-nine million, seven hundred forty-two thousand, four hundred seventy".