1992021540 has 48 divisors (see below), whose sum is σ = 5728414272. Its totient is φ = 516848256.

The previous prime is 1992021527. The next prime is 1992021547. The reversal of 1992021540 is 451202991.

It is not an unprimeable number, because it can be changed into a prime (1992021547) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 446434 + ... + 450873.

It is an arithmetic number, because the mean of its divisors is an integer number (119341964).

Almost surely, 2^1992021540 is an apocalyptic number.

1992021540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1992021540 is an abundant number, since it is smaller than the sum of its proper divisors (3736392732).

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

1992021540 is a wasteful number, since it uses less digits than its factorization.

1992021540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 897356 (or 897354 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 33.

The square root of 1992021540 is about 44632.0685158105. The cubic root of 1992021540 is about 1258.2434455135.

The spelling of 1992021540 in words is "one billion, nine hundred ninety-two million, twenty-one thousand, five hundred forty".