1299820 has 24 divisors (see below), whose sum is σ = 2890944. Its totient is φ = 489216.

The previous prime is 1299817. The next prime is 1299821. The reversal of 1299820 is 289921.

It is a hoax number, since the sum of its digits (31) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (1299821) 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, 1572 + ... + 2251.

It is an arithmetic number, because the mean of its divisors is an integer number (120456).

2^1299820 is an apocalyptic number.

1299820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1299820 is an abundant number, since it is smaller than the sum of its proper divisors (1591124).

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

1299820 is a wasteful number, since it uses less digits than its factorization.

1299820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3849 (or 3847 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 31.

The square root of 1299820 is about 1140.0964871448. The cubic root of 1299820 is about 109.1342508757.

The spelling of 1299820 in words is "one million, two hundred ninety-nine thousand, eight hundred twenty".