209464138727406 has 48 divisors (see below), whose sum is σ = 495418755686400. Its totient is φ = 66146570121528.

The previous prime is 209464138727399. The next prime is 209464138727413. The reversal of 209464138727406 is 604727831464902.

209464138727406 is a `hidden beast` number, since 2 + 0 + 9 + 464 + 1 + 38 + 72 + 74 + 0 + 6 = 666.

It is an interprime number because it is at equal distance from previous prime (209464138727399) and next prime (209464138727413).

It is a super-2 number, since 2×209464138727406² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11341995246 + ... + 11342013713.

It is an arithmetic number, because the mean of its divisors is an integer number (10321224076800).

Almost surely, 2^{209464138727406} is an apocalyptic number.

209464138727406 is an abundant number, since it is smaller than the sum of its proper divisors (285954616958994).

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

209464138727406 is a wasteful number, since it uses less digits than its factorization.

209464138727406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22684008995 (or 22684008983 counting only the distinct ones).

The product of its (nonzero) digits is 97542144, while the sum is 63.

The spelling of 209464138727406 in words is "two hundred nine trillion, four hundred sixty-four billion, one hundred thirty-eight million, seven hundred twenty-seven thousand, four hundred six".