1820445948 has 48 divisors (see below), whose sum is σ = 4768358560. Its totient is φ = 600556032.

The previous prime is 1820445947. The next prime is 1820445959. The reversal of 1820445948 is 8495440281.

1820445948 is a `hidden beast` number, since 18 + 2 + 0 + 44 + 594 + 8 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1820445943) 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, 76411 + ... + 97362.

Almost surely, 2^1820445948 is an apocalyptic number.

1820445948 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

1820445948 is an abundant number, since it is smaller than the sum of its proper divisors (2947912612).

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

1820445948 is a wasteful number, since it uses less digits than its factorization.

1820445948 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173883 (or 173875 counting only the distinct ones).

The product of its (nonzero) digits is 368640, while the sum is 45.

The square root of 1820445948 is about 42666.6842864547. The cubic root of 1820445948 is about 1221.0288615506.

The spelling of 1820445948 in words is "one billion, eight hundred twenty million, four hundred forty-five thousand, nine hundred forty-eight".