1023440420 has 24 divisors (see below), whose sum is σ = 2199208704. Its totient is φ = 399855456.

The previous prime is 1023440419. The next prime is 1023440423. The reversal of 1023440420 is 240443201.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 1023440392 and 1023440401.

It is not an unprimeable number, because it can be changed into a prime (1023440423) 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, 594164 + ... + 595883.

It is an arithmetic number, because the mean of its divisors is an integer number (91633696).

Almost surely, 2^1023440420 is an apocalyptic number.

1023440420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1023440420 is an abundant number, since it is smaller than the sum of its proper divisors (1175768284).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1023440420 is a wasteful number, since it uses less digits than its factorization.

1023440420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1190099 (or 1190097 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 20.

The square root of 1023440420 is about 31991.2553676782. The cubic root of 1023440420 is about 1007.7532057794.

Adding to 1023440420 its reverse (240443201), we get a palindrome (1263883621).

The spelling of 1023440420 in words is "one billion, twenty-three million, four hundred forty thousand, four hundred twenty".