102440142 has 24 divisors (see below), whose sum is σ = 253661616. Its totient is φ = 29268576.

The previous prime is 102440131. The next prime is 102440171. The reversal of 102440142 is 241044201.

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 11 ways as a sum of consecutive naturals, for example, 406383 + ... + 406634.

It is an arithmetic number, because the mean of its divisors is an integer number (10569234).

Almost surely, 2^102440142 is an apocalyptic number.

102440142 is an abundant number, since it is smaller than the sum of its proper divisors (151221474).

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

102440142 is a wasteful number, since it uses less digits than its factorization.

102440142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 813032 (or 813029 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

The square root of 102440142 is about 10121.2717580352. The cubic root of 102440142 is about 467.9039634192.

Adding to 102440142 its reverse (241044201), we get a palindrome (343484343).

The spelling of 102440142 in words is "one hundred two million, four hundred forty thousand, one hundred forty-two".