1821417234 has 64 divisors (see below), whose sum is σ = 4528016640. Its totient is φ = 475603200.

The previous prime is 1821417229. The next prime is 1821417337. The reversal of 1821417234 is 4327141281.

It is a junction number, because it is equal to n+sod(n) for n = 1821417195 and 1821417204.

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, 38632 + ... + 71660.

It is an arithmetic number, because the mean of its divisors is an integer number (70750260).

Almost surely, 2^1821417234 is an apocalyptic number.

1821417234 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1821417234, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2264008320).

1821417234 is an abundant number, since it is smaller than the sum of its proper divisors (2706599406).

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

1821417234 is a wasteful number, since it uses less digits than its factorization.

1821417234 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33155.

The product of its digits is 10752, while the sum is 33.

The square root of 1821417234 is about 42678.0650217416. The cubic root of 1821417234 is about 1221.2459800321.

The spelling of 1821417234 in words is "one billion, eight hundred twenty-one million, four hundred seventeen thousand, two hundred thirty-four".