919945 has 8 divisors (see below), whose sum is σ = 1188936. Its totient is φ = 679296.

The previous prime is 919939. The next prime is 919949. The reversal of 919945 is 549919.

It can be written as a sum of positive squares in 4 ways, for example, as 4096 + 915849 = 64^2 + 957^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 919945 - 2³ = 919937 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (919949) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7012 + ... + 7141.

It is an arithmetic number, because the mean of its divisors is an integer number (148617).

2⁹¹⁹⁹⁴⁵ is an apocalyptic number.

It is an amenable number.

919945 is a deficient number, since it is larger than the sum of its proper divisors (268991).

919945 is a wasteful number, since it uses less digits than its factorization.

919945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14171.

The product of its digits is 14580, while the sum is 37.

The square root of 919945 is about 959.1376335021. The cubic root of 919945 is about 97.2569444534.

The spelling of 919945 in words is "nine hundred nineteen thousand, nine hundred forty-five".