1801244400 has 60 divisors (see below), whose sum is σ = 5769990072. Its totient is φ = 480331520.

The previous prime is 1801244387. The next prime is 1801244437. The reversal of 1801244400 is 44421081.

It is a tau number, because it is divible by the number of its divisors (60).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 749319 + ... + 751718.

Almost surely, 2^1801244400 is an apocalyptic number.

1801244400 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1801244400 is an abundant number, since it is smaller than the sum of its proper divisors (3968745672).

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

1801244400 is a wasteful number, since it uses less digits than its factorization.

1801244400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1501058 (or 1501047 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 24.

The square root of 1801244400 is about 42441.0697320414. The cubic root of 1801244400 is about 1216.7206564728.

Adding to 1801244400 its reverse (44421081), we get a palindrome (1845665481).

The spelling of 1801244400 in words is "one billion, eight hundred one million, two hundred forty-four thousand, four hundred".