17800945 has 8 divisors (see below), whose sum is σ = 21384936. Its totient is φ = 14224896.

The previous prime is 17800933. The next prime is 17800957. The reversal of 17800945 is 54900871.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (17800933) and next prime (17800957).

It can be written as a sum of positive squares in 4 ways, for example, as 7612081 + 10188864 = 2759^2 + 3192^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a 4-Lehmer number, since φ(17800945) divides (17800945-1)⁴.

It is a cyclic number.

It is not a de Polignac number, because 17800945 - 2¹¹ = 17798897 is a prime.

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 17800945.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5569 + ... + 8161.

It is an arithmetic number, because the mean of its divisors is an integer number (2673117).

Almost surely, 2^17800945 is an apocalyptic number.

It is an amenable number.

17800945 is a deficient number, since it is larger than the sum of its proper divisors (3583991).

17800945 is a wasteful number, since it uses less digits than its factorization.

17800945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3971.

The product of its (nonzero) digits is 10080, while the sum is 34.

The square root of 17800945 is about 4219.1166137001. The cubic root of 17800945 is about 261.1044976277.

The spelling of 17800945 in words is "seventeen million, eight hundred thousand, nine hundred forty-five".