100809390 has 32 divisors (see below), whose sum is σ = 263938176. Its totient is φ = 24438560.

The previous prime is 100809353. The next prime is 100809409. The reversal of 100809390 is 93908001.

It is a happy number.

It is a super-2 number, since 2×100809390² = 20325066224344200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 152412 + ... + 153071.

It is an arithmetic number, because the mean of its divisors is an integer number (8248068).

Almost surely, 2^100809390 is an apocalyptic number.

100809390 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

100809390 is an abundant number, since it is smaller than the sum of its proper divisors (163128786).

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

100809390 is a wasteful number, since it uses less digits than its factorization.

100809390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 305504.

The product of its (nonzero) digits is 1944, while the sum is 30.

The square root of 100809390 is about 10040.3879407123. The cubic root of 100809390 is about 465.4078050438.

The spelling of 100809390 in words is "one hundred million, eight hundred nine thousand, three hundred ninety".