101800838 has 32 divisors (see below), whose sum is σ = 163430400. Its totient is φ = 47472480.

The previous prime is 101800837. The next prime is 101800843. The reversal of 101800838 is 838008101.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 101800838.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (101800837) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 456395 + ... + 456617.

It is an arithmetic number, because the mean of its divisors is an integer number (5107200).

Almost surely, 2^101800838 is an apocalyptic number.

101800838 is a deficient number, since it is larger than the sum of its proper divisors (61629562).

101800838 is a wasteful number, since it uses less digits than its factorization.

101800838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 492.

The product of its (nonzero) digits is 1536, while the sum is 29.

The square root of 101800838 is about 10089.6401323338. The cubic root of 101800838 is about 466.9285732778.

Adding to 101800838 its reverse (838008101), we get a palindrome (939808939).

The spelling of 101800838 in words is "one hundred one million, eight hundred thousand, eight hundred thirty-eight".