1229865 has 64 divisors (see below), whose sum is σ = 2612736. Its totient is φ = 479232.

The previous prime is 1229827. The next prime is 1229869. The reversal of 1229865 is 5689221.

It is not a de Polignac number, because 1229865 - 2⁹ = 1229353 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1229869) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 23179 + ... + 23231.

It is an arithmetic number, because the mean of its divisors is an integer number (40824).

2^1229865 is an apocalyptic number.

1229865 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1229865 is an abundant number, since it is smaller than the sum of its proper divisors (1382871).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1229865 is a wasteful number, since it uses less digits than its factorization.

1229865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98.

The product of its digits is 8640, while the sum is 33.

The square root of 1229865 is about 1108.9927862705. The cubic root of 1229865 is about 107.1402069186.

Multiplying 1229865 by its sum of digits (33), we get a triangular number (40585545 = T₉₀₀₉).

The spelling of 1229865 in words is "one million, two hundred twenty-nine thousand, eight hundred sixty-five".