2003120400 has 120 divisors (see below), whose sum is σ = 6436393600. Its totient is φ = 532523520.

The previous prime is 2003120381. The next prime is 2003120437. The reversal of 2003120400 is 40213002.

It is a tau number, because it is divible by the number of its divisors (120).

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a nialpdrome in base 16.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 416409 + ... + 421191.

Almost surely, 2^2003120400 is an apocalyptic number.

2003120400 is a gapful number since it is divisible by the number (20) 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 2003120400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3218196800).

2003120400 is an abundant number, since it is smaller than the sum of its proper divisors (4433273200).

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

2003120400 is a wasteful number, since it uses less digits than its factorization.

2003120400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5153 (or 5142 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 12.

The square root of 2003120400 is about 44756.2330854597. The cubic root of 2003120400 is about 1260.5759523606.

Adding to 2003120400 its reverse (40213002), we get a palindrome (2043333402).

The spelling of 2003120400 in words is "two billion, three million, one hundred twenty thousand, four hundred".