1404320421 has 16 divisors (see below), whose sum is σ = 2140596224. Its totient is φ = 802214064.

The previous prime is 1404320413. The next prime is 1404320441. The reversal of 1404320421 is 1240234041.

It is not a de Polignac number, because 1404320421 - 2³ = 1404320413 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1404320441) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 72096 + ... + 89478.

It is an arithmetic number, because the mean of its divisors is an integer number (133787264).

Almost surely, 2^1404320421 is an apocalyptic number.

It is an amenable number.

1404320421 is a deficient number, since it is larger than the sum of its proper divisors (736275803).

1404320421 is a wasteful number, since it uses less digits than its factorization.

1404320421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21240.

The product of its (nonzero) digits is 768, while the sum is 21.

The square root of 1404320421 is about 37474.2634483988. The cubic root of 1404320421 is about 1119.8385239673.

Adding to 1404320421 its reverse (1240234041), we get a palindrome (2644554462).

The spelling of 1404320421 in words is "one billion, four hundred four million, three hundred twenty thousand, four hundred twenty-one".