1172820 has 48 divisors (see below), whose sum is σ = 3584448. Its totient is φ = 284160.

The previous prime is 1172819. The next prime is 1172833. The reversal of 1172820 is 282711.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 229 + ... + 1548.

It is an arithmetic number, because the mean of its divisors is an integer number (74676).

2^1172820 is an apocalyptic number.

1172820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1172820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1792224).

1172820 is an abundant number, since it is smaller than the sum of its proper divisors (2411628).

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

1172820 is a wasteful number, since it uses less digits than its factorization.

1172820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1800 (or 1798 counting only the distinct ones).

The product of its (nonzero) digits is 224, while the sum is 21.

The square root of 1172820 is about 1082.9681435758. The cubic root of 1172820 is about 105.4574148861.

The spelling of 1172820 in words is "one million, one hundred seventy-two thousand, eight hundred twenty".