1023621 has 8 divisors (see below), whose sum is σ = 1445184. Its totient is φ = 642240.

The previous prime is 1023601. The next prime is 1023643. The reversal of 1023621 is 1263201.

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

It is not a de Polignac number, because 1023621 - 2⁶ = 1023557 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1023621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1023601) 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, 9985 + ... + 10086.

It is an arithmetic number, because the mean of its divisors is an integer number (180648).

2^1023621 is an apocalyptic number.

It is an amenable number.

1023621 is a deficient number, since it is larger than the sum of its proper divisors (421563).

1023621 is a wasteful number, since it uses less digits than its factorization.

1023621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20091.

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 1023621 is about 1011.7415677929. The cubic root of 1023621 is about 100.7812472988.

Adding to 1023621 its reverse (1263201), we get a palindrome (2286822).

The spelling of 1023621 in words is "one million, twenty-three thousand, six hundred twenty-one".