1228739042 has 4 divisors (see below), whose sum is σ = 1843108566. Its totient is φ = 614369520.

The previous prime is 1228739041. The next prime is 1228739047. The reversal of 1228739042 is 2409378221.

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., 1173816121 + 54922921 = 34261^2 + 7411^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1228738987 and 1228739005.

It is not an unprimeable number, because it can be changed into a prime (1228739041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 307184759 + ... + 307184762.

Almost surely, 2^1228739042 is an apocalyptic number.

1228739042 is a deficient number, since it is larger than the sum of its proper divisors (614369524).

1228739042 is an equidigital number, since it uses as much as digits as its factorization.

1228739042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 614369523.

The product of its (nonzero) digits is 48384, while the sum is 38.

The square root of 1228739042 is about 35053.3741885143. The cubic root of 1228739042 is about 1071.0750083396.

The spelling of 1228739042 in words is "one billion, two hundred twenty-eight million, seven hundred thirty-nine thousand, forty-two".