1401391 has 4 divisors (see below), whose sum is σ = 1409400. Its totient is φ = 1393384.

The previous prime is 1401377. The next prime is 1401401. The reversal of 1401391 is 1931041.

It is a happy number.

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 1401391 - 2⁷ = 1401263 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 (1401371) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3736 + ... + 4093.

It is an arithmetic number, because the mean of its divisors is an integer number (352350).

2^1401391 is an apocalyptic number.

1401391 is a deficient number, since it is larger than the sum of its proper divisors (8009).

1401391 is an equidigital number, since it uses as much as digits as its factorization.

1401391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8008.

The product of its (nonzero) digits is 108, while the sum is 19.

The square root of 1401391 is about 1183.8036154701. The cubic root of 1401391 is about 111.9059318567.

The spelling of 1401391 in words is "one million, four hundred one thousand, three hundred ninety-one".