223491840 has 432 divisors, whose sum is σ = 867751584. Its totient is φ = 48660480.

The previous prime is 223491839. The next prime is 223491841. The reversal of 223491840 is 48194322.

223491840 = T₁₆₉₆ + T₁₆₉₇ + ... + T₁₈₃₈.

It is an interprime number because it is at equal distance from previous prime (223491839) and next prime (223491841).

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (223491841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 6040302 + ... + 6040338.

Almost surely, 2^223491840 is an apocalyptic number.

223491840 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 223491840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (433875792).

223491840 is an abundant number, since it is smaller than the sum of its proper divisors (644259744).

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

223491840 is a wasteful number, since it uses less digits than its factorization.

223491840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96 (or 71 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 33.

The square root of 223491840 is about 14949.6434740097. The cubic root of 223491840 is about 606.8581987257.

The spelling of 223491840 in words is "two hundred twenty-three million, four hundred ninety-one thousand, eight hundred forty".