102443240 has 32 divisors (see below), whose sum is σ = 230942880. Its totient is φ = 40898112.

The previous prime is 102443239. The next prime is 102443249. The reversal of 102443240 is 42344201.

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

It is not an unprimeable number, because it can be changed into a prime (102443249) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21299 + ... + 25661.

It is an arithmetic number, because the mean of its divisors is an integer number (7216965).

Almost surely, 2^102443240 is an apocalyptic number.

102443240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

102443240 is an abundant number, since it is smaller than the sum of its proper divisors (128499640).

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

102443240 is a wasteful number, since it uses less digits than its factorization.

102443240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4961 (or 4957 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 20.

The square root of 102443240 is about 10121.4248008865. The cubic root of 102443240 is about 467.9086801635.

Adding to 102443240 its reverse (42344201), we get a palindrome (144787441).

The spelling of 102443240 in words is "one hundred two million, four hundred forty-three thousand, two hundred forty".