1401681 has 8 divisors (see below), whose sum is σ = 1908864. Its totient is φ = 914480.

The previous prime is 1401679. The next prime is 1401683. The reversal of 1401681 is 1861041.

It is an interprime number because it is at equal distance from previous prime (1401679) and next prime (1401683).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1401681 - 2¹ = 1401679 is a prime.

It is a super-2 number, since 2×1401681² = 3929419251522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1401683) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4830 + ... + 5111.

It is an arithmetic number, because the mean of its divisors is an integer number (238608).

It is the magic constant of a 141 × 141 magic square.

2^1401681 is an apocalyptic number.

It is an amenable number.

1401681 is a deficient number, since it is larger than the sum of its proper divisors (507183).

1401681 is an equidigital number, since it uses as much as digits as its factorization.

1401681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9991.

The product of its (nonzero) digits is 192, while the sum is 21.

The square root of 1401681 is about 1183.9260956664. The cubic root of 1401681 is about 111.9136504929.

The spelling of 1401681 in words is "one million, four hundred one thousand, six hundred eighty-one".