102981405 has 16 divisors (see below), whose sum is σ = 164983104. Its totient is φ = 54852480.

The previous prime is 102981391. The next prime is 102981409. The reversal of 102981405 is 504189201.

It is a happy number.

It is not a de Polignac number, because 102981405 - 2⁶ = 102981341 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102981409) 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, 8850 + ... + 16860.

It is an arithmetic number, because the mean of its divisors is an integer number (10311444).

Almost surely, 2^102981405 is an apocalyptic number.

102981405 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

102981405 is a deficient number, since it is larger than the sum of its proper divisors (62001699).

102981405 is an equidigital number, since it uses as much as digits as its factorization.

102981405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8876.

The product of its (nonzero) digits is 2880, while the sum is 30.

The square root of 102981405 is about 10147.9754138449. The cubic root of 102981405 is about 468.7266043434.

The spelling of 102981405 in words is "one hundred two million, nine hundred eighty-one thousand, four hundred five".