1229661 has 40 divisors (see below), whose sum is σ = 2090880. Its totient is φ = 715392.

The previous prime is 1229647. The next prime is 1229663. The reversal of 1229661 is 1669221.

It is not a de Polignac number, because 1229661 - 2⁶ = 1229597 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1229663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 26140 + ... + 26186.

It is an arithmetic number, because the mean of its divisors is an integer number (52272).

2^1229661 is an apocalyptic number.

It is an amenable number.

1229661 is a deficient number, since it is larger than the sum of its proper divisors (861219).

1229661 is a wasteful number, since it uses less digits than its factorization.

1229661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95 (or 86 counting only the distinct ones).

The product of its digits is 1296, while the sum is 27.

The square root of 1229661 is about 1108.9008071058. The cubic root of 1229661 is about 107.1342827424.

The spelling of 1229661 in words is "one million, two hundred twenty-nine thousand, six hundred sixty-one".