409697819138 has 16 divisors (see below), whose sum is σ = 650721861144. Its totient is φ = 192791470080.

The previous prime is 409697819131. The next prime is 409697819159. The reversal of 409697819138 is 831918796904.

It can be written as a sum of positive squares in 4 ways, for example, as 395758002649 + 13939816489 = 629093^2 + 118067^2 .

It is not an unprimeable number, because it can be changed into a prime (409697819131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 706706 + ... + 1148402.

Almost surely, 2^409697819138 is an apocalyptic number.

409697819138 is a deficient number, since it is larger than the sum of its proper divisors (241024042006).

409697819138 is a wasteful number, since it uses less digits than its factorization.

409697819138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 468997.

The product of its (nonzero) digits is 23514624, while the sum is 65.

The spelling of 409697819138 in words is "four hundred nine billion, six hundred ninety-seven million, eight hundred nineteen thousand, one hundred thirty-eight".