1440420432 has 80 divisors (see below), whose sum is σ = 4136038848. Its totient is φ = 428247040.

The previous prime is 1440420403. The next prime is 1440420433. The reversal of 1440420432 is 2340240441.

It is a happy number.

It is a super-2 number, since 2×1440420432² = 4149622041846133248, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1440420433) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2248 + ... + 53720.

Almost surely, 2^1440420432 is an apocalyptic number.

1440420432 is a gapful number since it is divisible by the number (12) 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 1440420432, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2068019424).

1440420432 is an abundant number, since it is smaller than the sum of its proper divisors (2695618416).

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

1440420432 is a wasteful number, since it uses less digits than its factorization.

1440420432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51548 (or 51542 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 24.

The square root of 1440420432 is about 37952.8711957343. The cubic root of 1440420432 is about 1129.3531244242.

Adding to 1440420432 its reverse (2340240441), we get a palindrome (3780660873).

Subtracting 1440420432 from its reverse (2340240441), we obtain a square (899820009 = 29997²).

The spelling of 1440420432 in words is "one billion, four hundred forty million, four hundred twenty thousand, four hundred thirty-two".