1804207440 has 400 divisors, whose sum is σ = 6801993216. Its totient is φ = 395136000.

The previous prime is 1804207411. The next prime is 1804207441. The reversal of 1804207440 is 447024081.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 1804207398 and 1804207407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1804207441) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 17863390 + ... + 17863490.

Almost surely, 2^1804207440 is an apocalyptic number.

1804207440 is a gapful number since it is divisible by the number (10) 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 1804207440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3400996608).

1804207440 is an abundant number, since it is smaller than the sum of its proper divisors (4997785776).

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

1804207440 is a wasteful number, since it uses less digits than its factorization.

1804207440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 176 (or 149 counting only the distinct ones).

The product of its (nonzero) digits is 7168, while the sum is 30.

The square root of 1804207440 is about 42475.9630850202. The cubic root of 1804207440 is about 1217.3874578864.

The spelling of 1804207440 in words is "one billion, eight hundred four million, two hundred seven thousand, four hundred forty".