1290729 has 8 divisors (see below), whose sum is σ = 1877472. Its totient is φ = 782240.

The previous prime is 1290719. The next prime is 1290791. The reversal of 1290729 is 9270921.

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 1290729 - 2¹² = 1286633 is a prime.

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 = 1290696 and 1290705.

It is not an unprimeable number, because it can be changed into a prime (1290719) 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, 19524 + ... + 19589.

It is an arithmetic number, because the mean of its divisors is an integer number (234684).

2^1290729 is an apocalyptic number.

It is an amenable number.

1290729 is a deficient number, since it is larger than the sum of its proper divisors (586743).

1290729 is a wasteful number, since it uses less digits than its factorization.

1290729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39127.

The product of its (nonzero) digits is 2268, while the sum is 30.

The square root of 1290729 is about 1136.1025481883. The cubic root of 1290729 is about 108.8792254293.

The spelling of 1290729 in words is "one million, two hundred ninety thousand, seven hundred twenty-nine".