1401891 has 4 divisors (see below), whose sum is σ = 1869192. Its totient is φ = 934592.

The previous prime is 1401857. The next prime is 1401937. The reversal of 1401891 is 1981041.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1981041 = 3 ⋅660347.

It is a cyclic number.

It is not a de Polignac number, because 1401891 - 2¹¹ = 1399843 is a prime.

It is a D-number.

It is not an unprimeable number, because it can be changed into a prime (1401811) 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, 233646 + ... + 233651.

It is an arithmetic number, because the mean of its divisors is an integer number (467298).

2^1401891 is an apocalyptic number.

1401891 is a deficient number, since it is larger than the sum of its proper divisors (467301).

1401891 is an equidigital number, since it uses as much as digits as its factorization.

1401891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 467300.

The product of its (nonzero) digits is 288, while the sum is 24.

The square root of 1401891 is about 1184.0147803132. The cubic root of 1401891 is about 111.9192391856.

The spelling of 1401891 in words is "one million, four hundred one thousand, eight hundred ninety-one".