100722406 has 4 divisors (see below), whose sum is σ = 151083612. Its totient is φ = 50361202.

The previous prime is 100722403. The next prime is 100722421. The reversal of 100722406 is 604227001.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 604227001 = 7 ⋅86318143.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100722403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25180600 + ... + 25180603.

It is an arithmetic number, because the mean of its divisors is an integer number (37770903).

Almost surely, 2^100722406 is an apocalyptic number.

100722406 is a deficient number, since it is larger than the sum of its proper divisors (50361206).

100722406 is an equidigital number, since it uses as much as digits as its factorization.

100722406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50361205.

The product of its (nonzero) digits is 672, while the sum is 22.

The square root of 100722406 is about 10036.0553007643. The cubic root of 100722406 is about 465.2739065323.

Adding to 100722406 its reverse (604227001), we get a palindrome (704949407).

The spelling of 100722406 in words is "one hundred million, seven hundred twenty-two thousand, four hundred six".