1989691410 has 32 divisors (see below), whose sum is σ = 5457439872. Its totient is φ = 454786560.

The previous prime is 1989691357. The next prime is 1989691427. The reversal of 1989691410 is 141969891.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 1989691410.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4737151 + ... + 4737570.

It is an arithmetic number, because the mean of its divisors is an integer number (170544996).

Almost surely, 2^1989691410 is an apocalyptic number.

1989691410 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1989691410 is an abundant number, since it is smaller than the sum of its proper divisors (3467748462).

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

1989691410 is a wasteful number, since it uses less digits than its factorization.

1989691410 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9474738.

The product of its (nonzero) digits is 139968, while the sum is 48.

The square root of 1989691410 is about 44605.9571133722. The cubic root of 1989691410 is about 1257.7526518396.

The spelling of 1989691410 in words is "one billion, nine hundred eighty-nine million, six hundred ninety-one thousand, four hundred ten".