1451421440 has 144 divisors (see below), whose sum is σ = 4146605568. Its totient is φ = 475926528.

The previous prime is 1451421421. The next prime is 1451421449. The reversal of 1451421440 is 441241541.

It is a nialpdrome in base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1451421449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 202559 + ... + 209601.

It is an arithmetic number, because the mean of its divisors is an integer number (28795872).

Almost surely, 2^1451421440 is an apocalyptic number.

1451421440 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 1451421440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2073302784).

1451421440 is an abundant number, since it is smaller than the sum of its proper divisors (2695184128).

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

1451421440 is an equidigital number, since it uses as much as digits as its factorization.

1451421440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7094 (or 7080 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 26.

The square root of 1451421440 is about 38097.5253789534. The cubic root of 1451421440 is about 1132.2209277163.

Adding to 1451421440 its reverse (441241541), we get a palindrome (1892662981).

The spelling of 1451421440 in words is "one billion, four hundred fifty-one million, four hundred twenty-one thousand, four hundred forty".