218836438040 has 32 divisors (see below), whose sum is σ = 537143985360. Its totient is φ = 79576886400.

The previous prime is 218836438021. The next prime is 218836438049. The reversal of 218836438040 is 40834638812.

It is a super-2 number, since 2×218836438040² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218836438049) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 248677331 + ... + 248678210.

Almost surely, 2^218836438040 is an apocalyptic number.

218836438040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

218836438040 is an abundant number, since it is smaller than the sum of its proper divisors (318307547320).

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

218836438040 is a wasteful number, since it uses less digits than its factorization.

218836438040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 497355563 (or 497355559 counting only the distinct ones).

The product of its (nonzero) digits is 884736, while the sum is 47.

The spelling of 218836438040 in words is "two hundred eighteen billion, eight hundred thirty-six million, four hundred thirty-eight thousand, forty".