1440136421 has 8 divisors (see below), whose sum is σ = 1517343360. Its totient is φ = 1364145552.

The previous prime is 1440136417. The next prime is 1440136441. The reversal of 1440136421 is 1246310441.

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 not a de Polignac number, because 1440136421 - 2² = 1440136417 is a prime.

It is a super-2 number, since 2×1440136421² = 4147985822181378482, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1440136441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 301586 + ... + 306323.

It is an arithmetic number, because the mean of its divisors is an integer number (189667920).

Almost surely, 2^1440136421 is an apocalyptic number.

It is an amenable number.

1440136421 is a deficient number, since it is larger than the sum of its proper divisors (77206939).

1440136421 is a wasteful number, since it uses less digits than its factorization.

1440136421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 608035.

The product of its (nonzero) digits is 2304, while the sum is 26.

The square root of 1440136421 is about 37949.1293839529. The cubic root of 1440136421 is about 1129.2788938301.

Adding to 1440136421 its reverse (1246310441), we get a palindrome (2686446862).

The spelling of 1440136421 in words is "one billion, four hundred forty million, one hundred thirty-six thousand, four hundred twenty-one".