908621 has 4 divisors (see below), whose sum is σ = 1038432. Its totient is φ = 778812.

The previous prime is 908617. The next prime is 908623. The reversal of 908621 is 126809.

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, and also an emirpimes, since its reverse is a distinct semiprime: 126809 = 173 ⋅733.

It is a cyclic number.

It is not a de Polignac number, because 908621 - 2² = 908617 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (908623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64895 + ... + 64908.

It is an arithmetic number, because the mean of its divisors is an integer number (259608).

2⁹⁰⁸⁶²¹ is an apocalyptic number.

It is an amenable number.

908621 is a deficient number, since it is larger than the sum of its proper divisors (129811).

908621 is a wasteful number, since it uses less digits than its factorization.

908621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129810.

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 908621 is about 953.2161349872. The cubic root of 908621 is about 96.8562365325.

The spelling of 908621 in words is "nine hundred eight thousand, six hundred twenty-one".