1023420494 has 4 divisors (see below), whose sum is σ = 1535130744. Its totient is φ = 511710246.

The previous prime is 1023420487. The next prime is 1023420499. The reversal of 1023420494 is 4940243201.

It is a semiprime because it is the product of two primes.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1023420499) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 255855122 + ... + 255855125.

It is an arithmetic number, because the mean of its divisors is an integer number (383782686).

Almost surely, 2^1023420494 is an apocalyptic number.

1023420494 is a deficient number, since it is larger than the sum of its proper divisors (511710250).

1023420494 is an equidigital number, since it uses as much as digits as its factorization.

1023420494 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 511710249.

The product of its (nonzero) digits is 6912, while the sum is 29.

The square root of 1023420494 is about 31990.9439373083. The cubic root of 1023420494 is about 1007.7466655450.

Adding to 1023420494 its reverse (4940243201), we get a palindrome (5963663695).

The spelling of 1023420494 in words is "one billion, twenty-three million, four hundred twenty thousand, four hundred ninety-four".