102120405 has 32 divisors (see below), whose sum is σ = 167132160. Its totient is φ = 53230080.

The previous prime is 102120371. The next prime is 102120433. The reversal of 102120405 is 504021201.

It is not a de Polignac number, because 102120405 - 2⁶ = 102120341 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 212956 + ... + 213434.

It is an arithmetic number, because the mean of its divisors is an integer number (5222880).

Almost surely, 2^102120405 is an apocalyptic number.

102120405 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

102120405 is a deficient number, since it is larger than the sum of its proper divisors (65011755).

102120405 is a wasteful number, since it uses less digits than its factorization.

102120405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 781.

The product of its (nonzero) digits is 80, while the sum is 15.

The square root of 102120405 is about 10105.4641160117. The cubic root of 102120405 is about 467.4166475168.

Adding to 102120405 its reverse (504021201), we get a palindrome (606141606).

The spelling of 102120405 in words is "one hundred two million, one hundred twenty thousand, four hundred five".