1851825420 has 36 divisors (see below), whose sum is σ = 5617204320. Its totient is φ = 493820064.

The previous prime is 1851825407. The next prime is 1851825431. The reversal of 1851825420 is 245281581.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5143780 + ... + 5144139.

Almost surely, 2^1851825420 is an apocalyptic number.

1851825420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1851825420 is an abundant number, since it is smaller than the sum of its proper divisors (3765378900).

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

1851825420 is a wasteful number, since it uses less digits than its factorization.

1851825420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10287934 (or 10287929 counting only the distinct ones).

The product of its (nonzero) digits is 25600, while the sum is 36.

The square root of 1851825420 is about 43032.8411797316. The cubic root of 1851825420 is about 1228.0046569725.

The spelling of 1851825420 in words is "one billion, eight hundred fifty-one million, eight hundred twenty-five thousand, four hundred twenty".