1810390428 has 144 divisors (see below), whose sum is σ = 5732004096. Its totient is φ = 468046080.

The previous prime is 1810390423. The next prime is 1810390441. The reversal of 1810390428 is 8240930181.

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

It is a junction number, because it is equal to n+sod(n) for n = 1810390392 and 1810390401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1810390423) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 644475 + ... + 647277.

It is an arithmetic number, because the mean of its divisors is an integer number (39805584).

Almost surely, 2^1810390428 is an apocalyptic number.

1810390428 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1810390428, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2866002048).

1810390428 is an abundant number, since it is smaller than the sum of its proper divisors (3921613668).

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

1810390428 is a wasteful number, since it uses less digits than its factorization.

1810390428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3064 (or 3059 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 36.

The square root of 1810390428 is about 42548.6830348484. The cubic root of 1810390428 is about 1218.7765276435.

The spelling of 1810390428 in words is "one billion, eight hundred ten million, three hundred ninety thousand, four hundred twenty-eight".