102140505 has 96 divisors (see below), whose sum is σ = 199480320. Its totient is φ = 48107520.

The previous prime is 102140503. The next prime is 102140509. The reversal of 102140505 is 505041201.

It is not a de Polignac number, because 102140505 - 2¹ = 102140503 is a prime.

It is not an unprimeable number, because it can be changed into a prime (102140501) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1399149 + ... + 1399221.

It is an arithmetic number, because the mean of its divisors is an integer number (2077920).

Almost surely, 2^102140505 is an apocalyptic number.

102140505 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

102140505 is a deficient number, since it is larger than the sum of its proper divisors (97339815).

102140505 is a wasteful number, since it uses less digits than its factorization.

102140505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 191 (or 188 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 18.

The square root of 102140505 is about 10106.4585785526. The cubic root of 102140505 is about 467.4473121630.

Adding to 102140505 its reverse (505041201), we get a palindrome (607181706).

The spelling of 102140505 in words is "one hundred two million, one hundred forty thousand, five hundred five".