1400729 has 8 divisors (see below), whose sum is σ = 1581120. Its totient is φ = 1229200.

The previous prime is 1400701. The next prime is 1400731. The reversal of 1400729 is 9270041.

1400729 = 126² + 127² + ... + 183².

1400729 is nontrivially palindromic in base 3.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1400729 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a Curzon number.

It is a nialpdrome in base 11.

It is not an unprimeable number, because it can be changed into a prime (1400029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1877 + ... + 2514.

It is an arithmetic number, because the mean of its divisors is an integer number (197640).

2^1400729 is an apocalyptic number.

It is an amenable number.

1400729 is a deficient number, since it is larger than the sum of its proper divisors (180391).

1400729 is a wasteful number, since it uses less digits than its factorization.

1400729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4431.

The product of its (nonzero) digits is 504, while the sum is 23.

The square root of 1400729 is about 1183.5239752536. The cubic root of 1400729 is about 111.8883080826. Note that the first 3 decimals are identical.

The spelling of 1400729 in words is "one million, four hundred thousand, seven hundred twenty-nine".