1000423440 has 160 divisors (see below), whose sum is σ = 3564950400. Its totient is φ = 257564160.

The previous prime is 1000423439. The next prime is 1000423451. The reversal of 1000423440 is 443240001.

It is a super-4 number, since 4×1000423440⁴ (a number of 37 digits) contains 4444 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 54655 + ... + 70625.

It is an arithmetic number, because the mean of its divisors is an integer number (22280940).

Almost surely, 2^1000423440 is an apocalyptic number.

1000423440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1000423440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1782475200).

1000423440 is an abundant number, since it is smaller than the sum of its proper divisors (2564526960).

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

1000423440 is a wasteful number, since it uses less digits than its factorization.

1000423440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16022 (or 16010 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

The square root of 1000423440 is about 31629.4710673448. The cubic root of 1000423440 is about 1000.1411267490.

Adding to 1000423440 its reverse (443240001), we get a palindrome (1443663441).

The spelling of 1000423440 in words is "one billion, four hundred twenty-three thousand, four hundred forty".