209748419 has 4 divisors (see below), whose sum is σ = 209892480. Its totient is φ = 209604360.

The previous prime is 209748403. The next prime is 209748421. The reversal of 209748419 is 914847902.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 209748419 - 2⁴ = 209748403 is a prime.

It is a super-2 number, since 2×209748419² = 87988798545999122, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 209748419.

It is not an unprimeable number, because it can be changed into a prime (209748919) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 69824 + ... + 72765.

It is an arithmetic number, because the mean of its divisors is an integer number (52473120).

Almost surely, 2^209748419 is an apocalyptic number.

209748419 is a deficient number, since it is larger than the sum of its proper divisors (144061).

209748419 is a wasteful number, since it uses less digits than its factorization.

209748419 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144060.

The product of its (nonzero) digits is 145152, while the sum is 44.

The square root of 209748419 is about 14482.6937756758. The cubic root of 209748419 is about 594.1547388663.

The spelling of 209748419 in words is "two hundred nine million, seven hundred forty-eight thousand, four hundred nineteen".