1208920840 has 32 divisors (see below), whose sum is σ = 2777950080. Its totient is φ = 473278912.

The previous prime is 1208920819. The next prime is 1208920841. The reversal of 1208920840 is 480298021.

It is a super-2 number, since 2×1208920840² = 2922979194772611200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1208920796 and 1208920805.

It is not an unprimeable number, because it can be changed into a prime (1208920841) 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 7 ways as a sum of consecutive naturals, for example, 319642 + ... + 323401.

It is an arithmetic number, because the mean of its divisors is an integer number (86810940).

Almost surely, 2^1208920840 is an apocalyptic number.

1208920840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1208920840 is an abundant number, since it is smaller than the sum of its proper divisors (1569029240).

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

1208920840 is a wasteful number, since it uses less digits than its factorization.

1208920840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 643101 (or 643097 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 34.

The square root of 1208920840 is about 34769.5389673202. The cubic root of 1208920840 is about 1065.2853504447.

The spelling of 1208920840 in words is "one billion, two hundred eight million, nine hundred twenty thousand, eight hundred forty".