102400665 has 16 divisors (see below), whose sum is σ = 163968000. Its totient is φ = 54571392.

The previous prime is 102400663. The next prime is 102400681. The reversal of 102400665 is 566004201.

It is not a de Polignac number, because 102400665 - 2¹ = 102400663 is a prime.

It is not an unprimeable number, because it can be changed into a prime (102400663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32061 + ... + 35109.

It is an arithmetic number, because the mean of its divisors is an integer number (10248000).

Almost surely, 2^102400665 is an apocalyptic number.

102400665 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

102400665 is a deficient number, since it is larger than the sum of its proper divisors (61567335).

102400665 is a wasteful number, since it uses less digits than its factorization.

102400665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5296.

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 102400665 is about 10119.3213705268. The cubic root of 102400665 is about 467.8438508576.

Adding to 102400665 its reverse (566004201), we get a palindrome (668404866).

The spelling of 102400665 in words is "one hundred two million, four hundred thousand, six hundred sixty-five".