81384902 has 16 divisors (see below), whose sum is σ = 128397312. Its totient is φ = 38613960.

The previous prime is 81384887. The next prime is 81384907. The reversal of 81384902 is 20948318.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81384907) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1124 + ... + 12807.

It is an arithmetic number, because the mean of its divisors is an integer number (8024832).

Almost surely, 2^81384902 is an apocalyptic number.

81384902 is a deficient number, since it is larger than the sum of its proper divisors (47012410).

81384902 is a wasteful number, since it uses less digits than its factorization.

81384902 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14083.

The product of its (nonzero) digits is 13824, while the sum is 35.

The square root of 81384902 is about 9021.3581017494. The cubic root of 81384902 is about 433.3591275901.

The spelling of 81384902 in words is "eighty-one million, three hundred eighty-four thousand, nine hundred two".