1209990378 has 16 divisors (see below), whose sum is σ = 2454065856. Its totient is φ = 397649280.

The previous prime is 1209990367. The next prime is 1209990389. The reversal of 1209990378 is 8730999021.

It is an interprime number because it is at equal distance from previous prime (1209990367) and next prime (1209990389).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1419751 + ... + 1420602.

It is an arithmetic number, because the mean of its divisors is an integer number (153379116).

Almost surely, 2^1209990378 is an apocalyptic number.

1209990378 is an abundant number, since it is smaller than the sum of its proper divisors (1244075478).

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

1209990378 is a wasteful number, since it uses less digits than its factorization.

1209990378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2840429.

The product of its (nonzero) digits is 244944, while the sum is 48.

The square root of 1209990378 is about 34784.9159550516. The cubic root of 1209990378 is about 1065.5994121793.

The spelling of 1209990378 in words is "one billion, two hundred nine million, nine hundred ninety thousand, three hundred seventy-eight".