100397865 has 16 divisors (see below), whose sum is σ = 160921728. Its totient is φ = 53450496.

The previous prime is 100397863. The next prime is 100397867. The reversal of 100397865 is 568793001.

It is an interprime number because it is at equal distance from previous prime (100397863) and next prime (100397867).

It is not a de Polignac number, because 100397865 - 2¹ = 100397863 is a prime.

It is not an unprimeable number, because it can be changed into a prime (100397863) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3252 + ... + 14538.

It is an arithmetic number, because the mean of its divisors is an integer number (10057608).

Almost surely, 2^100397865 is an apocalyptic number.

100397865 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

100397865 is a deficient number, since it is larger than the sum of its proper divisors (60523863).

100397865 is a wasteful number, since it uses less digits than its factorization.

100397865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11888.

The product of its (nonzero) digits is 45360, while the sum is 39.

The square root of 100397865 is about 10019.8735021955. The cubic root of 100397865 is about 464.7736440220.

The spelling of 100397865 in words is "one hundred million, three hundred ninety-seven thousand, eight hundred sixty-five".