1023994 has 4 divisors (see below), whose sum is σ = 1535994. Its totient is φ = 511996.

The previous prime is 1023991. The next prime is 1024021. The reversal of 1023994 is 4993201.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 4993201 = 31 ⋅161071.

It can be written as a sum of positive squares in only one way, i.e., 874225 + 149769 = 935^2 + 387^2 .

It is not an unprimeable number, because it can be changed into a prime (1023991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 255997 + ... + 256000.

2^1023994 is an apocalyptic number.

1023994 is a deficient number, since it is larger than the sum of its proper divisors (512000).

1023994 is an equidigital number, since it uses as much as digits as its factorization.

1023994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 511999.

The product of its (nonzero) digits is 1944, while the sum is 28.

The square root of 1023994 is about 1011.9258866142. The cubic root of 1023994 is about 100.7934871285.

It can be divided in two parts, 102 and 3994, that added together give a 12-th power (4096 = 2¹²).

The spelling of 1023994 in words is "one million, twenty-three thousand, nine hundred ninety-four".