1404988621 has 4 divisors (see below), whose sum is σ = 1420775100. Its totient is φ = 1389202144.

The previous prime is 1404988601. The next prime is 1404988631. The reversal of 1404988621 is 1268894041.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1268894041 = 53 ⋅23941397.

It can be written as a sum of positive squares in 2 ways, for example, as 460102500 + 944886121 = 21450^2 + 30739^2 .

It is a cyclic number.

It is not a de Polignac number, because 1404988621 - 2⁵ = 1404988589 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 (1404988601) 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 3 ways as a sum of consecutive naturals, for example, 7893106 + ... + 7893283.

It is an arithmetic number, because the mean of its divisors is an integer number (355193775).

Almost surely, 2^1404988621 is an apocalyptic number.

It is an amenable number.

1404988621 is a deficient number, since it is larger than the sum of its proper divisors (15786479).

1404988621 is an equidigital number, since it uses as much as digits as its factorization.

1404988621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15786478.

The product of its (nonzero) digits is 110592, while the sum is 43.

The square root of 1404988621 is about 37483.1778401992. The cubic root of 1404988621 is about 1120.0161086650.

It can be divided in two parts, 1404 and 988621, that added together give a square (990025 = 995²).

The spelling of 1404988621 in words is "one billion, four hundred four million, nine hundred eighty-eight thousand, six hundred twenty-one".