1209869830 has 16 divisors (see below), whose sum is σ = 2345286384. Its totient is φ = 446721120.

The previous prime is 1209869819. The next prime is 1209869831. The reversal of 1209869830 is 389689021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1209869831) 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, 4653216 + ... + 4653475.

It is an arithmetic number, because the mean of its divisors is an integer number (146580399).

Almost surely, 2^1209869830 is an apocalyptic number.

1209869830 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1209869830 is a deficient number, since it is larger than the sum of its proper divisors (1135416554).

1209869830 is a wasteful number, since it uses less digits than its factorization.

1209869830 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9306711.

The product of its (nonzero) digits is 186624, while the sum is 46.

The square root of 1209869830 is about 34783.1831493324. The cubic root of 1209869830 is about 1065.5640234285.

It can be divided in two parts, 120986 and 9830, that added together give a triangular number (130816 = T₅₁₁).

The spelling of 1209869830 in words is "one billion, two hundred nine million, eight hundred sixty-nine thousand, eight hundred thirty".