1129921 has 8 divisors (see below), whose sum is σ = 1270080. Its totient is φ = 997392.

The previous prime is 1129897. The next prime is 1129951. The reversal of 1129921 is 1299211.

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 1129921 - 2⁵ = 1129889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1129951) 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, 1591 + ... + 2188.

It is an arithmetic number, because the mean of its divisors is an integer number (158760).

2^1129921 is an apocalyptic number.

It is an amenable number.

1129921 is a deficient number, since it is larger than the sum of its proper divisors (140159).

1129921 is a wasteful number, since it uses less digits than its factorization.

1129921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3815.

The product of its digits is 324, while the sum is 25.

The square root of 1129921 is about 1062.9774221497. The cubic root of 1129921 is about 104.1556163922.

The spelling of 1129921 in words is "one million, one hundred twenty-nine thousand, nine hundred twenty-one".