266400423 has 12 divisors (see below), whose sum is σ = 386041968. Its totient is φ = 177027360.

The previous prime is 266400413. The next prime is 266400439. The reversal of 266400423 is 324004662.

It is not a de Polignac number, because 266400423 - 2¹⁴ = 266384039 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (266400413) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 44790 + ... + 50387.

It is an arithmetic number, because the mean of its divisors is an integer number (32170164).

Almost surely, 2^266400423 is an apocalyptic number.

266400423 is a deficient number, since it is larger than the sum of its proper divisors (119641545).

266400423 is a wasteful number, since it uses less digits than its factorization.

266400423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95494 (or 95491 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 27.

The square root of 266400423 is about 16321.7775686351. Note that the first 3 decimals coincide. The cubic root of 266400423 is about 643.4453055449.

It can be divided in two parts, 266 and 400423, that added together give a square (400689 = 633²).

The spelling of 266400423 in words is "two hundred sixty-six million, four hundred thousand, four hundred twenty-three".