1440340421 has 8 divisors (see below), whose sum is σ = 1553233920. Its totient is φ = 1327746672.

The previous prime is 1440340411. The next prime is 1440340441. The reversal of 1440340421 is 1240430441.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1440340421 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1440340411) 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, 64901 + ... + 84218.

It is an arithmetic number, because the mean of its divisors is an integer number (194154240).

Almost surely, 2^1440340421 is an apocalyptic number.

It is an amenable number.

1440340421 is a deficient number, since it is larger than the sum of its proper divisors (112893499).

1440340421 is a wasteful number, since it uses less digits than its factorization.

1440340421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149875.

The product of its (nonzero) digits is 1536, while the sum is 23.

The square root of 1440340421 is about 37951.8170974724. The cubic root of 1440340421 is about 1129.3322133199.

Adding to 1440340421 its reverse (1240430441), we get a palindrome (2680770862).

The spelling of 1440340421 in words is "one billion, four hundred forty million, three hundred forty thousand, four hundred twenty-one".