102440139 has 8 divisors (see below), whose sum is σ = 136883712. Its totient is φ = 68145000.

The previous prime is 102440131. The next prime is 102440171. The reversal of 102440139 is 931044201.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 102440139 - 2³ = 102440131 is a prime.

It is not an unprimeable number, because it can be changed into a prime (102440131) 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, 35487 + ... + 38264.

It is an arithmetic number, because the mean of its divisors is an integer number (17110464).

Almost surely, 2^102440139 is an apocalyptic number.

102440139 is a deficient number, since it is larger than the sum of its proper divisors (34443573).

102440139 is an equidigital number, since it uses as much as digits as its factorization.

102440139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74217.

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 102440139 is about 10121.2716098324. The cubic root of 102440139 is about 467.9039588516.

The spelling of 102440139 in words is "one hundred two million, four hundred forty thousand, one hundred thirty-nine".