1421244640 has 24 divisors (see below), whose sum is σ = 3357690840. Its totient is φ = 568497792.

The previous prime is 1421244637. The next prime is 1421244677. The reversal of 1421244640 is 464421241.

It is a junction number, because it is equal to n+sod(n) for n = 1421244599 and 1421244608.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4441230 + ... + 4441549.

It is an arithmetic number, because the mean of its divisors is an integer number (139903785).

Almost surely, 2^1421244640 is an apocalyptic number.

1421244640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1421244640 is an abundant number, since it is smaller than the sum of its proper divisors (1936446200).

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

1421244640 is an equidigital number, since it uses as much as digits as its factorization.

1421244640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8882794 (or 8882786 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 28.

The square root of 1421244640 is about 37699.3984036881. The cubic root of 1421244640 is about 1124.3191640167.

Adding to 1421244640 its reverse (464421241), we get a palindrome (1885665881).

The spelling of 1421244640 in words is "one billion, four hundred twenty-one million, two hundred forty-four thousand, six hundred forty".