102340240 has 20 divisors (see below), whose sum is σ = 237941244. Its totient is φ = 40936064.

The previous prime is 102340237. The next prime is 102340247. The reversal of 102340240 is 42043201.

It can be written as a sum of positive squares in 2 ways, for example, as 17405584 + 84934656 = 4172^2 + 9216^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a Harshad number since it is a multiple of its sum of digits (16).

It is not an unprimeable number, because it can be changed into a prime (102340247) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 639547 + ... + 639706.

Almost surely, 2^102340240 is an apocalyptic number.

102340240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

102340240 is an abundant number, since it is smaller than the sum of its proper divisors (135601004).

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

102340240 is a wasteful number, since it uses less digits than its factorization.

102340240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1279266 (or 1279260 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 16.

The square root of 102340240 is about 10116.3353048424. The cubic root of 102340240 is about 467.7518103519.

Adding to 102340240 its reverse (42043201), we get a palindrome (144383441).

The spelling of 102340240 in words is "one hundred two million, three hundred forty thousand, two hundred forty".