1281629 has 8 divisors (see below), whose sum is σ = 1352832. Its totient is φ = 1211760.

The previous prime is 1281587. The next prime is 1281649. The reversal of 1281629 is 9261821.

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-1281629 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1281649) 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, 2099 + ... + 2639.

It is an arithmetic number, because the mean of its divisors is an integer number (169104).

2^1281629 is an apocalyptic number.

It is an amenable number.

1281629 is a deficient number, since it is larger than the sum of its proper divisors (71203).

1281629 is a wasteful number, since it uses less digits than its factorization.

1281629 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 667.

The product of its digits is 1728, while the sum is 29.

The square root of 1281629 is about 1132.0905440821. The cubic root of 1281629 is about 108.6227454119.

The spelling of 1281629 in words is "one million, two hundred eighty-one thousand, six hundred twenty-nine".