209042625 has 96 divisors (see below), whose sum is σ = 406328832. Its totient is φ = 95040000.

The previous prime is 209042623. The next prime is 209042627. The reversal of 209042625 is 526240902.

It is an interprime number because it is at equal distance from previous prime (209042623) and next prime (209042627).

It is not a de Polignac number, because 209042625 - 2¹ = 209042623 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 209042592 and 209042601.

It is not an unprimeable number, because it can be changed into a prime (209042621) 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, 771240 + ... + 771510.

It is an arithmetic number, because the mean of its divisors is an integer number (4232592).

Almost surely, 2^209042625 is an apocalyptic number.

209042625 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

209042625 is a deficient number, since it is larger than the sum of its proper divisors (197286207).

209042625 is a wasteful number, since it uses less digits than its factorization.

209042625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 328 (or 307 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 30.

The square root of 209042625 is about 14458.3064360941. The cubic root of 209042625 is about 593.4875552968.

The spelling of 209042625 in words is "two hundred nine million, forty-two thousand, six hundred twenty-five".