209428075 has 6 divisors (see below), whose sum is σ = 259690844. Its totient is φ = 167542440.

The previous prime is 209428073. The next prime is 209428129. The reversal of 209428075 is 570824902.

It is not a de Polignac number, because 209428075 - 2¹ = 209428073 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (209428073) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4188537 + ... + 4188586.

Almost surely, 2^209428075 is an apocalyptic number.

209428075 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

209428075 is a deficient number, since it is larger than the sum of its proper divisors (50262769).

209428075 is an equidigital number, since it uses as much as digits as its factorization.

209428075 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8377133 (or 8377128 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 37.

The square root of 209428075 is about 14471.6300049442. The cubic root of 209428075 is about 593.8521050627.

The spelling of 209428075 in words is "two hundred nine million, four hundred twenty-eight thousand, seventy-five".