1989057087 has 32 divisors (see below), whose sum is σ = 3007445760. Its totient is φ = 1298812320.

The previous prime is 1989057053. The next prime is 1989057097. The reversal of 1989057087 is 7807509891.

It is not a de Polignac number, because 1989057087 - 2¹⁵ = 1989024319 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1989057097) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1675108 + ... + 1676294.

It is an arithmetic number, because the mean of its divisors is an integer number (93982680).

Almost surely, 2^1989057087 is an apocalyptic number.

1989057087 is a deficient number, since it is larger than the sum of its proper divisors (1018388673).

1989057087 is a wasteful number, since it uses less digits than its factorization.

1989057087 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2420 (or 2414 counting only the distinct ones).

The product of its (nonzero) digits is 1270080, while the sum is 54.

The square root of 1989057087 is about 44598.8462518931. The cubic root of 1989057087 is about 1257.6189784754.

The spelling of 1989057087 in words is "one billion, nine hundred eighty-nine million, fifty-seven thousand, eighty-seven".