100399887 has 24 divisors (see below), whose sum is σ = 168554880. Its totient is φ = 56396880.

The previous prime is 100399867. The next prime is 100399889. The reversal of 100399887 is 788993001.

It is not a de Polignac number, because 100399887 - 2⁸ = 100399631 is a prime.

It is a super-2 number, since 2×100399887² = 20160274619225538, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100399889) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9789 + ... + 17222.

It is an arithmetic number, because the mean of its divisors is an integer number (7023120).

Almost surely, 2^100399887 is an apocalyptic number.

100399887 is a deficient number, since it is larger than the sum of its proper divisors (68154993).

100399887 is a wasteful number, since it uses less digits than its factorization.

100399887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27083 (or 27080 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 45.

The square root of 100399887 is about 10019.9744011649. The cubic root of 100399887 is about 464.7767641613.

The spelling of 100399887 in words is "one hundred million, three hundred ninety-nine thousand, eight hundred eighty-seven".