201123400 has 24 divisors (see below), whose sum is σ = 467612370. Its totient is φ = 80449280.

The previous prime is 201123397. The next prime is 201123401. The reversal of 201123400 is 4321102.

It can be written as a sum of positive squares in 3 ways, for example, as 132664324 + 68459076 = 11518^2 + 8274^2 .

It is not an unprimeable number, because it can be changed into a prime (201123401) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 502609 + ... + 503008.

Almost surely, 2^201123400 is an apocalyptic number.

201123400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

201123400 is an abundant number, since it is smaller than the sum of its proper divisors (266488970).

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

201123400 is a wasteful number, since it uses less digits than its factorization.

201123400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1005633 (or 1005624 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 201123400 is about 14181.7981934591. The cubic root of 201123400 is about 585.8964510858.

Adding to 201123400 its reverse (4321102), we get a palindrome (205444502).

The spelling of 201123400 in words is "two hundred one million, one hundred twenty-three thousand, four hundred".