1023659 has 12 divisors (see below), whose sum is σ = 1283184. Its totient is φ = 809424.

The previous prime is 1023653. The next prime is 1023697. The reversal of 1023659 is 9563201.

It is not a de Polignac number, because 1023659 - 2⁴ = 1023643 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1023653) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 167 + ... + 1440.

It is an arithmetic number, because the mean of its divisors is an integer number (106932).

2^1023659 is an apocalyptic number.

1023659 is a deficient number, since it is larger than the sum of its proper divisors (259525).

1023659 is a wasteful number, since it uses less digits than its factorization.

1023659 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1634 (or 1627 counting only the distinct ones).

The product of its (nonzero) digits is 1620, while the sum is 26.

The square root of 1023659 is about 1011.7603471178. The cubic root of 1023659 is about 100.7824943880.

The spelling of 1023659 in words is "one million, twenty-three thousand, six hundred fifty-nine".