920649 has 4 divisors (see below), whose sum is σ = 1227536. Its totient is φ = 613764.

The previous prime is 920641. The next prime is 920651. The reversal of 920649 is 946029.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 920649 - 2³ = 920641 is a prime.

It is a D-number.

It is a Duffinian number.

It is a Curzon number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 920649.

It is not an unprimeable number, because it can be changed into a prime (920641) 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, 153439 + ... + 153444.

It is an arithmetic number, because the mean of its divisors is an integer number (306884).

2⁹²⁰⁶⁴⁹ is an apocalyptic number.

It is an amenable number.

920649 is a deficient number, since it is larger than the sum of its proper divisors (306887).

920649 is a wasteful number, since it uses less digits than its factorization.

920649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 306886.

The product of its (nonzero) digits is 3888, while the sum is 30.

The square root of 920649 is about 959.5045596557. The cubic root of 920649 is about 97.2817471791.

The spelling of 920649 in words is "nine hundred twenty thousand, six hundred forty-nine".