266212440 has 256 divisors, whose sum is σ = 973324800. Its totient is φ = 64323072.

The previous prime is 266212423. The next prime is 266212487. The reversal of 266212440 is 44212662.

266212440 is a `hidden beast` number, since 2 + 6 + 6 + 212 + 440 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 940539 + ... + 940821.

It is an arithmetic number, because the mean of its divisors is an integer number (3802050).

Almost surely, 2^266212440 is an apocalyptic number.

266212440 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 266212440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (486662400).

266212440 is an abundant number, since it is smaller than the sum of its proper divisors (707112360).

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

266212440 is a wasteful number, since it uses less digits than its factorization.

266212440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 383 (or 373 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 27.

The square root of 266212440 is about 16316.0178965335. The cubic root of 266212440 is about 643.2939228515.

The spelling of 266212440 in words is "two hundred sixty-six million, two hundred twelve thousand, four hundred forty".