1851420890 has 32 divisors (see below), whose sum is σ = 3685334976. Its totient is φ = 664018560.

The previous prime is 1851420881. The next prime is 1851420913. The reversal of 1851420890 is 980241581.

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 107252 + ... + 123311.

It is an arithmetic number, because the mean of its divisors is an integer number (115166718).

Almost surely, 2^1851420890 is an apocalyptic number.

1851420890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1851420890 is a deficient number, since it is larger than the sum of its proper divisors (1833914086).

1851420890 is a wasteful number, since it uses less digits than its factorization.

1851420890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 230654.

The product of its (nonzero) digits is 23040, while the sum is 38.

The square root of 1851420890 is about 43028.1406756090. The cubic root of 1851420890 is about 1227.9152315340.

The spelling of 1851420890 in words is "one billion, eight hundred fifty-one million, four hundred twenty thousand, eight hundred ninety".