1233401978 has 4 divisors (see below), whose sum is σ = 1850102970. Its totient is φ = 616700988.

The previous prime is 1233401971. The next prime is 1233401999. The reversal of 1233401978 is 8791043321.

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., 1229413969 + 3988009 = 35063^2 + 1997^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1233401971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 308350493 + ... + 308350496.

Almost surely, 2^1233401978 is an apocalyptic number.

1233401978 is a deficient number, since it is larger than the sum of its proper divisors (616700992).

1233401978 is an equidigital number, since it uses as much as digits as its factorization.

1233401978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 616700991.

The product of its (nonzero) digits is 36288, while the sum is 38.

The square root of 1233401978 is about 35119.8231487575. The cubic root of 1233401978 is about 1072.4281705779.

The spelling of 1233401978 in words is "one billion, two hundred thirty-three million, four hundred one thousand, nine hundred seventy-eight".