1821493536 has 48 divisors (see below), whose sum is σ = 4935667968. Its totient is φ = 587577600.

The previous prime is 1821493529. The next prime is 1821493537. The reversal of 1821493536 is 6353941281.

It is a tau number, because it is divible by the number of its divisors (48).

It is not an unprimeable number, because it can be changed into a prime (1821493537) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 303055 + ... + 309006.

It is an arithmetic number, because the mean of its divisors is an integer number (102826416).

Almost surely, 2^1821493536 is an apocalyptic number.

1821493536 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1821493536 is an abundant number, since it is smaller than the sum of its proper divisors (3114174432).

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

1821493536 is a wasteful number, since it uses less digits than its factorization.

1821493536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 612105 (or 612097 counting only the distinct ones).

The product of its digits is 155520, while the sum is 42.

The square root of 1821493536 is about 42678.9589376311. The cubic root of 1821493536 is about 1221.2630330916.

The spelling of 1821493536 in words is "one billion, eight hundred twenty-one million, four hundred ninety-three thousand, five hundred thirty-six".