2123823900 has 72 divisors (see below), whose sum is σ = 6703570944. Its totient is φ = 514865600.

The previous prime is 2123823899. The next prime is 2123823901. The reversal of 2123823900 is 93283212.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (2123823899) and next prime (2123823901).

It is a super-2 number, since 2×2123823900² = 9021255916422420000, which contains 22 as substring.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2123823901) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 318492 + ... + 325091.

It is an arithmetic number, because the mean of its divisors is an integer number (93105152).

Almost surely, 2^2123823900 is an apocalyptic number.

2123823900 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2123823900 is an abundant number, since it is smaller than the sum of its proper divisors (4579747044).

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

2123823900 is a wasteful number, since it uses less digits than its factorization.

2123823900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 643611 (or 643604 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 30.

The square root of 2123823900 is about 46084.9639253412. The cubic root of 2123823900 is about 1285.4035684779.

The spelling of 2123823900 in words is "two billion, one hundred twenty-three million, eight hundred twenty-three thousand, nine hundred".