1822781840 has 40 divisors (see below), whose sum is σ = 4623239808. Its totient is φ = 662829440.

The previous prime is 1822781819. The next prime is 1822781843. The reversal of 1822781840 is 481872281.

It is a tau number, because it is divible by the number of its divisors (40).

It is not an unprimeable number, because it can be changed into a prime (1822781843) 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, 1034792 + ... + 1036551.

Almost surely, 2^1822781840 is an apocalyptic number.

1822781840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1822781840 is an abundant number, since it is smaller than the sum of its proper divisors (2800457968).

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

1822781840 is a wasteful number, since it uses less digits than its factorization.

1822781840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2071367 (or 2071361 counting only the distinct ones).

The product of its (nonzero) digits is 57344, while the sum is 41.

The square root of 1822781840 is about 42694.0492340560. The cubic root of 1822781840 is about 1221.5508897746.

The spelling of 1822781840 in words is "one billion, eight hundred twenty-two million, seven hundred eighty-one thousand, eight hundred forty".