1230729 has 4 divisors (see below), whose sum is σ = 1640976. Its totient is φ = 820484.

The previous prime is 1230727. The next prime is 1230739. The reversal of 1230729 is 9270321.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1230729 - 2¹ = 1230727 is a prime.

It is a D-number.

It is an alternating number because its digits alternate between odd and even.

It is a junction number, because it is equal to n+sod(n) for n = 1230699 and 1230708.

It is not an unprimeable number, because it can be changed into a prime (1230727) 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, 205119 + ... + 205124.

It is an arithmetic number, because the mean of its divisors is an integer number (410244).

2^1230729 is an apocalyptic number.

It is an amenable number.

1230729 is a deficient number, since it is larger than the sum of its proper divisors (410247).

1230729 is an equidigital number, since it uses as much as digits as its factorization.

1230729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 410246.

The product of its (nonzero) digits is 756, while the sum is 24.

The square root of 1230729 is about 1109.3822605396. The cubic root of 1230729 is about 107.1652902868.

The spelling of 1230729 in words is "one million, two hundred thirty thousand, seven hundred twenty-nine".