129240250 has 24 divisors (see below), whose sum is σ = 242274708. Its totient is φ = 51624200.

The previous prime is 129240233. The next prime is 129240259. The reversal of 129240250 is 52042921.

It can be written as a sum of positive squares in 2 ways, for example, as 87366409 + 41873841 = 9347^2 + 6471^2 .

It is a Harshad number since it is a multiple of its sum of digits (25).

It is not an unprimeable number, because it can be changed into a prime (129240259) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 179391 + ... + 180109.

Almost surely, 2^129240250 is an apocalyptic number.

129240250 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

129240250 is a deficient number, since it is larger than the sum of its proper divisors (113034458).

129240250 is an frugal number, since it uses more digits than its factorization.

129240250 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1455 (or 726 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 129240250 is about 11368.3881883053. The cubic root of 129240250 is about 505.5909169450.

Multiplying 129240250 by its product of nonzero digits (1440), we get a square (186105960000 = 431400²).

The spelling of 129240250 in words is "one hundred twenty-nine million, two hundred forty thousand, two hundred fifty".