1400721 has 8 divisors (see below), whose sum is σ = 2134464. Its totient is φ = 800400.

The previous prime is 1400701. The next prime is 1400731. The reversal of 1400721 is 1270041.

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

It is not a de Polignac number, because 1400721 - 2⁵ = 1400689 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1400721.

It is not an unprimeable number, because it can be changed into a prime (1400701) 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, 33330 + ... + 33371.

It is an arithmetic number, because the mean of its divisors is an integer number (266808).

2^1400721 is an apocalyptic number.

It is an amenable number.

1400721 is a deficient number, since it is larger than the sum of its proper divisors (733743).

1400721 is an equidigital number, since it uses as much as digits as its factorization.

1400721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66711.

The product of its (nonzero) digits is 56, while the sum is 15.

The square root of 1400721 is about 1183.5205955115. The cubic root of 1400721 is about 111.8880950725. Note that the first 3 decimals are identical.

Adding to 1400721 its reverse (1270041), we get a palindrome (2670762).

It can be divided in two parts, 14007 and 21, that added together give a triangular number (14028 = T₁₆₇).

The spelling of 1400721 in words is "one million, four hundred thousand, seven hundred twenty-one".