100400785 has 8 divisors (see below), whose sum is σ = 124367616. Its totient is φ = 77729520.

The previous prime is 100400749. The next prime is 100400791. The reversal of 100400785 is 587004001.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 100400785 - 2⁹ = 100400273 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 323719 + ... + 324028.

It is an arithmetic number, because the mean of its divisors is an integer number (15545952).

Almost surely, 2^100400785 is an apocalyptic number.

It is an amenable number.

100400785 is a deficient number, since it is larger than the sum of its proper divisors (23966831).

100400785 is an equidigital number, since it uses as much as digits as its factorization.

100400785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 647783.

The product of its (nonzero) digits is 1120, while the sum is 25.

The square root of 100400785 is about 10020.0192115584. The cubic root of 100400785 is about 464.7781498478.

Adding to 100400785 its reverse (587004001), we get a palindrome (687404786).

The spelling of 100400785 in words is "one hundred million, four hundred thousand, seven hundred eighty-five".