101840409 has 20 divisors (see below), whose sum is σ = 165963600. Its totient is φ = 61720920.

The previous prime is 101840407. The next prime is 101840443. The reversal of 101840409 is 904048101.

It is not a de Polignac number, because 101840409 - 2¹ = 101840407 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (101840407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 56259 + ... + 58040.

It is an arithmetic number, because the mean of its divisors is an integer number (8298180).

Almost surely, 2^101840409 is an apocalyptic number.

It is an amenable number.

101840409 is a deficient number, since it is larger than the sum of its proper divisors (64123191).

101840409 is a wasteful number, since it uses less digits than its factorization.

101840409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114322 (or 114313 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 27.

The square root of 101840409 is about 10091.6009136311. The cubic root of 101840409 is about 466.9890653701.

The spelling of 101840409 in words is "one hundred one million, eight hundred forty thousand, four hundred nine".