1238239978 has 4 divisors (see below), whose sum is σ = 1857359970. Its totient is φ = 619119988.

The previous prime is 1238239973. The next prime is 1238239993. The reversal of 1238239978 is 8799328321.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 943534089 + 294705889 = 30717^2 + 17167^2 .

It is not an unprimeable number, because it can be changed into a prime (1238239973) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 309559993 + ... + 309559996.

Almost surely, 2^1238239978 is an apocalyptic number.

1238239978 is a deficient number, since it is larger than the sum of its proper divisors (619119992).

1238239978 is an equidigital number, since it uses as much as digits as its factorization.

1238239978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 619119991.

The product of its digits is 1306368, while the sum is 52.

The square root of 1238239978 is about 35188.6342161784. The cubic root of 1238239978 is about 1073.8285354522.

The spelling of 1238239978 in words is "one billion, two hundred thirty-eight million, two hundred thirty-nine thousand, nine hundred seventy-eight".