1423521440 has 72 divisors (see below), whose sum is σ = 3696647220. Its totient is φ = 517637120.

The previous prime is 1423521433. The next prime is 1423521443. The reversal of 1423521440 is 441253241.

It can be written as a sum of positive squares in 2 ways, for example, as 1421893264 + 1628176 = 37708^2 + 1276^2 .

It is not an unprimeable number, because it can be changed into a prime (1423521443) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 17405 + ... + 56124.

Almost surely, 2^1423521440 is an apocalyptic number.

1423521440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1423521440 is an abundant number, since it is smaller than the sum of its proper divisors (2273125780).

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

1423521440 is a wasteful number, since it uses less digits than its factorization.

1423521440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73566 (or 73547 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 26.

The square root of 1423521440 is about 37729.5830880756. The cubic root of 1423521440 is about 1124.9192211958.

Adding to 1423521440 its reverse (441253241), we get a palindrome (1864774681).

The spelling of 1423521440 in words is "one billion, four hundred twenty-three million, five hundred twenty-one thousand, four hundred forty".