1401721 has 2 divisors, whose sum is σ = 1401722. Its totient is φ = 1401720.

The previous prime is 1401713. The next prime is 1401737. The reversal of 1401721 is 1271041.

It is an a-pointer prime, because the next prime (1401737) can be obtained adding 1401721 to its sum of digits (16).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 876096 + 525625 = 936^2 + 725^2 .

It is a cyclic number.

It is not a de Polignac number, because 1401721 - 2³ = 1401713 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1401695 and 1401704.

It is not a weakly prime, because it can be changed into another prime (1401761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 700860 + 700861.

It is an arithmetic number, because the mean of its divisors is an integer number (700861).

2^1401721 is an apocalyptic number.

It is an amenable number.

1401721 is a deficient number, since it is larger than the sum of its proper divisors (1).

1401721 is an equidigital number, since it uses as much as digits as its factorization.

1401721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 56, while the sum is 16.

The square root of 1401721 is about 1183.9429884923. The cubic root of 1401721 is about 111.9147150488.

Adding to 1401721 its reverse (1271041), we get a palindrome (2672762).

The spelling of 1401721 in words is "one million, four hundred one thousand, seven hundred twenty-one".