102531440 has 160 divisors (see below), whose sum is σ = 276839424. Its totient is φ = 34974720.

The previous prime is 102531427. The next prime is 102531449. The reversal of 102531440 is 44135201.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102531449) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1530287 + ... + 1530353.

Almost surely, 2^102531440 is an apocalyptic number.

102531440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 102531440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (138419712).

102531440 is an abundant number, since it is smaller than the sum of its proper divisors (174307984).

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

102531440 is a wasteful number, since it uses less digits than its factorization.

102531440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 175 (or 169 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 102531440 is about 10125.7809575361. The cubic root of 102531440 is about 468.0429259090.

Adding to 102531440 its reverse (44135201), we get a palindrome (146666641).

The spelling of 102531440 in words is "one hundred two million, five hundred thirty-one thousand, four hundred forty".