1019878243 has 4 divisors (see below), whose sum is σ = 1020248280. Its totient is φ = 1019508208.

The previous prime is 1019878231. The next prime is 1019878271. The reversal of 1019878243 is 3428789101.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3428789101 = 23 ⋅149077787.

It is a cyclic number.

It is not a de Polignac number, because 1019878243 - 2¹³ = 1019870051 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1019878243.

It is not an unprimeable number, because it can be changed into a prime (1019878283) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 180853 + ... + 186406.

It is an arithmetic number, because the mean of its divisors is an integer number (255062070).

Almost surely, 2^1019878243 is an apocalyptic number.

1019878243 is a deficient number, since it is larger than the sum of its proper divisors (370037).

1019878243 is an equidigital number, since it uses as much as digits as its factorization.

1019878243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 370036.

The product of its (nonzero) digits is 96768, while the sum is 43.

The square root of 1019878243 is about 31935.5326086790. The cubic root of 1019878243 is about 1006.5826545803.

The spelling of 1019878243 in words is "one billion, nineteen million, eight hundred seventy-eight thousand, two hundred forty-three".