1404781421 has 2 divisors, whose sum is σ = 1404781422. Its totient is φ = 1404781420.

The previous prime is 1404781409. The next prime is 1404781447. The reversal of 1404781421 is 1241874041.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 897901225 + 506880196 = 29965^2 + 22514^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1404781421 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1404781471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 702390710 + 702390711.

It is an arithmetic number, because the mean of its divisors is an integer number (702390711).

Almost surely, 2^1404781421 is an apocalyptic number.

It is an amenable number.

1404781421 is a deficient number, since it is larger than the sum of its proper divisors (1).

1404781421 is an equidigital number, since it uses as much as digits as its factorization.

1404781421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7168, while the sum is 32.

The square root of 1404781421 is about 37480.4138317602. The cubic root of 1404781421 is about 1119.9610480182.

The spelling of 1404781421 in words is "one billion, four hundred four million, seven hundred eighty-one thousand, four hundred twenty-one".