209868233400 has 1152 divisors, whose sum is σ = 912541593600. Its totient is φ = 42091315200.

The previous prime is 209868233387. The next prime is 209868233479. The reversal of 209868233400 is 4332868902.

209868233400 is a `hidden beast` number, since 2 + 0 + 9 + 8 + 6 + 8 + 233 + 400 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 287 ways as a sum of consecutive naturals, for example, 201990081 + ... + 201991119.

It is an arithmetic number, because the mean of its divisors is an integer number (792136800).

Almost surely, 2^209868233400 is an apocalyptic number.

209868233400 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 209868233400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (456270796800).

209868233400 is an abundant number, since it is smaller than the sum of its proper divisors (702673360200).

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

209868233400 is a wasteful number, since it uses less digits than its factorization.

209868233400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1149 (or 1137 counting only the distinct ones).

The product of its (nonzero) digits is 497664, while the sum is 45.

The spelling of 209868233400 in words is "two hundred nine billion, eight hundred sixty-eight million, two hundred thirty-three thousand, four hundred".