1404991 has 4 divisors (see below), whose sum is σ = 1605712. Its totient is φ = 1204272.

The previous prime is 1404989. The next prime is 1405007. The reversal of 1404991 is 1994041.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1404991 - 2¹ = 1404989 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 (1404911) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 100350 + ... + 100363.

It is an arithmetic number, because the mean of its divisors is an integer number (401428).

2^1404991 is an apocalyptic number.

1404991 is a deficient number, since it is larger than the sum of its proper divisors (200721).

1404991 is an equidigital number, since it uses as much as digits as its factorization.

1404991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 200720.

The product of its (nonzero) digits is 1296, while the sum is 28.

The square root of 1404991 is about 1185.3231626860. The cubic root of 1404991 is about 112.0016740821.

The spelling of 1404991 in words is "one million, four hundred four thousand, nine hundred ninety-one".