100388025 has 24 divisors (see below), whose sum is σ = 184417760. Its totient is φ = 53539920.

The previous prime is 100388021. The next prime is 100388027. The reversal of 100388025 is 520883001.

It is a happy number.

It is not a de Polignac number, because 100388025 - 2² = 100388021 is a prime.

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

It is a self number, because there is not a number n which added to its sum of digits gives 100388025.

It is not an unprimeable number, because it can be changed into a prime (100388021) 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, 73687 + ... + 75036.

Almost surely, 2^100388025 is an apocalyptic number.

100388025 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

100388025 is a deficient number, since it is larger than the sum of its proper divisors (84029735).

100388025 is a wasteful number, since it uses less digits than its factorization.

100388025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148742 (or 148731 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 27.

The square root of 100388025 is about 10019.3824660006. The cubic root of 100388025 is about 464.7584593628.

The spelling of 100388025 in words is "one hundred million, three hundred eighty-eight thousand, twenty-five".