100785407 has 4 divisors (see below), whose sum is σ = 100805760. Its totient is φ = 100765056.

The previous prime is 100785389. The next prime is 100785431. The reversal of 100785407 is 704587001.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 704587001 = 661 ⋅1065941.

It is a cyclic number.

It is not a de Polignac number, because 100785407 - 2¹² = 100781311 is a prime.

It is a super-4 number, since 4×100785407⁴ (a number of 33 digits) contains 4444 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100785457) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2594 + ... + 14432.

It is an arithmetic number, because the mean of its divisors is an integer number (25201440).

Almost surely, 2^100785407 is an apocalyptic number.

100785407 is a deficient number, since it is larger than the sum of its proper divisors (20353).

100785407 is an equidigital number, since it uses as much as digits as its factorization.

100785407 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20352.

The product of its (nonzero) digits is 7840, while the sum is 32.

The square root of 100785407 is about 10039.1935433081. The cubic root of 100785407 is about 465.3708945911.

The spelling of 100785407 in words is "one hundred million, seven hundred eighty-five thousand, four hundred seven".