1817421970 has 64 divisors (see below), whose sum is σ = 4043483136. Its totient is φ = 572728320.

The previous prime is 1817421959. The next prime is 1817421997. The reversal of 1817421970 is 791247181.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 215167 + ... + 223453.

It is an arithmetic number, because the mean of its divisors is an integer number (63179424).

Almost surely, 2^1817421970 is an apocalyptic number.

1817421970 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1817421970 is an abundant number, since it is smaller than the sum of its proper divisors (2226061166).

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

1817421970 is a wasteful number, since it uses less digits than its factorization.

1817421970 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8555.

The product of its (nonzero) digits is 28224, while the sum is 40.

The square root of 1817421970 is about 42631.2323302998. The cubic root of 1817421970 is about 1220.3523952899.

The spelling of 1817421970 in words is "one billion, eight hundred seventeen million, four hundred twenty-one thousand, nine hundred seventy".