1618321830 has 64 divisors (see below), whose sum is σ = 4015484928. Its totient is φ = 416983680.

The previous prime is 1618321807. The next prime is 1618321841. The reversal of 1618321830 is 381238161.

It is an alternating number because its digits alternate between odd and even.

It is a junction number, because it is equal to n+sod(n) for n = 1618321791 and 1618321800.

It is a congruent number.

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, 987772 + ... + 989408.

It is an arithmetic number, because the mean of its divisors is an integer number (62741952).

Almost surely, 2^1618321830 is an apocalyptic number.

1618321830 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1618321830, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2007742464).

1618321830 is an abundant number, since it is smaller than the sum of its proper divisors (2397163098).

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

1618321830 is a wasteful number, since it uses less digits than its factorization.

1618321830 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2741.

The product of its (nonzero) digits is 6912, while the sum is 33.

The square root of 1618321830 is about 40228.3709588146. The cubic root of 1618321830 is about 1174.0546081958.

Adding to 1618321830 its reverse (381238161), we get a palindrome (1999559991).

The spelling of 1618321830 in words is "one billion, six hundred eighteen million, three hundred twenty-one thousand, eight hundred thirty".