1299920 has 20 divisors (see below), whose sum is σ = 3022500. Its totient is φ = 519936.

The previous prime is 1299919. The next prime is 1299941. The reversal of 1299920 is 299921.

It can be written as a sum of positive squares in 2 ways, for example, as 620944 + 678976 = 788^2 + 824^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a plaindrome in base 13.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 8045 + ... + 8204.

It is an arithmetic number, because the mean of its divisors is an integer number (151125).

2^1299920 is an apocalyptic number.

1299920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1299920 is an abundant number, since it is smaller than the sum of its proper divisors (1722580).

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

1299920 is a wasteful number, since it uses less digits than its factorization.

1299920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16262 (or 16256 counting only the distinct ones).

The product of its (nonzero) digits is 2916, while the sum is 32.

The square root of 1299920 is about 1140.1403422386. The cubic root of 1299920 is about 109.1370495056.

Subtracting from 1299920 its reverse (299921), we obtain a palindrome (999999).

The spelling of 1299920 in words is "one million, two hundred ninety-nine thousand, nine hundred twenty".