102142405 has 8 divisors (see below), whose sum is σ = 123466392. Its totient is φ = 81116928.

The previous prime is 102142399. The next prime is 102142429. The reversal of 102142405 is 504241201.

It can be written as a sum of positive squares in 4 ways, for example, as 19368801 + 82773604 = 4401^2 + 9098^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 102142405 - 2¹³ = 102134213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 73872 + ... + 75241.

It is an arithmetic number, because the mean of its divisors is an integer number (15433299).

Almost surely, 2^102142405 is an apocalyptic number.

It is an amenable number.

102142405 is a deficient number, since it is larger than the sum of its proper divisors (21323987).

102142405 is a wasteful number, since it uses less digits than its factorization.

102142405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149255.

The product of its (nonzero) digits is 320, while the sum is 19.

The square root of 102142405 is about 10106.5525774123. The cubic root of 102142405 is about 467.4502106031.

Adding to 102142405 its reverse (504241201), we get a palindrome (606383606).

The spelling of 102142405 in words is "one hundred two million, one hundred forty-two thousand, four hundred five".