1228739642 has 8 divisors (see below), whose sum is σ = 1984887156. Its totient is φ = 567110592.

The previous prime is 1228739641. The next prime is 1228739683. The reversal of 1228739642 is 2469378221.

It can be written as a sum of positive squares in 2 ways, for example, as 1045164241 + 183575401 = 32329^2 + 13549^2 .

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

It is a super-2 number, since 2×1228739642² = 3019602215644576328, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1228739593 and 1228739602.

It is not an unprimeable number, because it can be changed into a prime (1228739641) 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, 23629583 + ... + 23629634.

Almost surely, 2^1228739642 is an apocalyptic number.

1228739642 is a deficient number, since it is larger than the sum of its proper divisors (756147514).

1228739642 is a wasteful number, since it uses less digits than its factorization.

1228739642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47259232.

The product of its digits is 290304, while the sum is 44.

The square root of 1228739642 is about 35053.3827468905. The cubic root of 1228739642 is about 1071.0751826768.

The spelling of 1228739642 in words is "one billion, two hundred twenty-eight million, seven hundred thirty-nine thousand, six hundred forty-two".