1989798270 has 64 divisors (see below), whose sum is σ = 4833354240. Its totient is φ = 524216448.

The previous prime is 1989798221. The next prime is 1989798277. The reversal of 1989798270 is 728979891.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1989798277) 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, 1526439 + ... + 1527741.

It is an arithmetic number, because the mean of its divisors is an integer number (75521160).

Almost surely, 2^1989798270 is an apocalyptic number.

1989798270 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1989798270 is an abundant number, since it is smaller than the sum of its proper divisors (2843555970).

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

1989798270 is a wasteful number, since it uses less digits than its factorization.

1989798270 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1889.

The product of its (nonzero) digits is 4572288, while the sum is 60.

The square root of 1989798270 is about 44607.1549193624. The cubic root of 1989798270 is about 1257.7751680686.

The spelling of 1989798270 in words is "one billion, nine hundred eighty-nine million, seven hundred ninety-eight thousand, two hundred seventy".