102312155440 has 80 divisors (see below), whose sum is σ = 268449202080. Its totient is φ = 35921500160.

The previous prime is 102312155423. The next prime is 102312155447. The reversal of 102312155440 is 44551213201.

It is a tau number, because it is divible by the number of its divisors (80).

It is a junction number, because it is equal to n+sod(n) for n = 102312155399 and 102312155408.

It is not an unprimeable number, because it can be changed into a prime (102312155447) 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, 1979029 + ... + 2030068.

It is an arithmetic number, because the mean of its divisors is an integer number (3355615026).

Almost surely, 2^102312155440 is an apocalyptic number.

102312155440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

102312155440 is an abundant number, since it is smaller than the sum of its proper divisors (166137046640).

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

102312155440 is a wasteful number, since it uses less digits than its factorization.

102312155440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4009150 (or 4009144 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 28.

Adding to 102312155440 its reverse (44551213201), we get a palindrome (146863368641).

It can be divided in two parts, 102312 and 155440, that added together give a palindrome (257752).

The spelling of 102312155440 in words is "one hundred two billion, three hundred twelve million, one hundred fifty-five thousand, four hundred forty".