1989492540 has 48 divisors (see below), whose sum is σ = 6366377472. Its totient is φ = 454741056.

The previous prime is 1989492499. The next prime is 1989492587. The reversal of 1989492540 is 452949891.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 2368024 + ... + 2368863.

It is an arithmetic number, because the mean of its divisors is an integer number (132632864).

Almost surely, 2^1989492540 is an apocalyptic number.

1989492540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1989492540 is an abundant number, since it is smaller than the sum of its proper divisors (4376884932).

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

1989492540 is a wasteful number, since it uses less digits than its factorization.

1989492540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4736906 (or 4736904 counting only the distinct ones).

The product of its (nonzero) digits is 933120, while the sum is 51.

The square root of 1989492540 is about 44603.7278711096. The cubic root of 1989492540 is about 1257.7107462452.

The spelling of 1989492540 in words is "one billion, nine hundred eighty-nine million, four hundred ninety-two thousand, five hundred forty".