1978238019 has 8 divisors (see below), whose sum is σ = 2669429952. Its totient is φ = 1302935720.

The previous prime is 1978237993. The next prime is 1978238039. The reversal of 1978238019 is 9108328791.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1978238019 - 2¹⁷ = 1978106947 is a prime.

It is a super-2 number, since 2×1978238019² = 7826851319634088722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1978238039) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3972117 + ... + 3972614.

It is an arithmetic number, because the mean of its divisors is an integer number (333678744).

Almost surely, 2^1978238019 is an apocalyptic number.

1978238019 is a deficient number, since it is larger than the sum of its proper divisors (691191933).

1978238019 is an equidigital number, since it uses as much as digits as its factorization.

1978238019 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7944817.

The product of its (nonzero) digits is 217728, while the sum is 48.

The square root of 1978238019 is about 44477.3877267989. The cubic root of 1978238019 is about 1255.3346449169.

The spelling of 1978238019 in words is "one billion, nine hundred seventy-eight million, two hundred thirty-eight thousand, nineteen".