102312440 has 32 divisors (see below), whose sum is σ = 232984080. Its totient is φ = 40430592.

The previous prime is 102312421. The next prime is 102312449. The reversal of 102312440 is 44213201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102312449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12089 + ... + 18728.

Almost surely, 2^102312440 is an apocalyptic number.

102312440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

102312440 is an abundant number, since it is smaller than the sum of its proper divisors (130671640).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

102312440 is a wasteful number, since it uses less digits than its factorization.

102312440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30911 (or 30907 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 102312440 is about 10114.9611961688. The cubic root of 102312440 is about 467.7094526962.

Adding to 102312440 its reverse (44213201), we get a palindrome (146525641).

The spelling of 102312440 in words is "one hundred two million, three hundred twelve thousand, four hundred forty".