102405240 has 96 divisors (see below), whose sum is σ = 380371680. Its totient is φ = 23406336.

The previous prime is 102405181. The next prime is 102405271. The reversal of 102405240 is 42504201.

102405240 is a `hidden beast` number, since 102 + 40 + 524 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 17799 + ... + 22838.

It is an arithmetic number, because the mean of its divisors is an integer number (3962205).

Almost surely, 2^102405240 is an apocalyptic number.

102405240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

102405240 is an abundant number, since it is smaller than the sum of its proper divisors (277966440).

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

102405240 is a wasteful number, since it uses less digits than its factorization.

102405240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40661 (or 40654 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 18.

The square root of 102405240 is about 10119.5474207101. The cubic root of 102405240 is about 467.8508181097.

Adding to 102405240 its reverse (42504201), we get a palindrome (144909441).

The spelling of 102405240 in words is "one hundred two million, four hundred five thousand, two hundred forty".