1228745394 has 12 divisors (see below), whose sum is σ = 2662281726. Its totient is φ = 409581792.

The previous prime is 1228745377. The next prime is 1228745411. The reversal of 1228745394 is 4935478221.

It is an interprime number because it is at equal distance from previous prime (1228745377) and next prime (1228745411).

It can be written as a sum of positive squares in only one way, i.e., 923369769 + 305375625 = 30387^2 + 17475^2 .

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 34131799 + ... + 34131834.

Almost surely, 2^1228745394 is an apocalyptic number.

1228745394 is an abundant number, since it is smaller than the sum of its proper divisors (1433536332).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1228745394 is a wasteful number, since it uses less digits than its factorization.

1228745394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68263641 (or 68263638 counting only the distinct ones).

The product of its digits is 483840, while the sum is 45.

The square root of 1228745394 is about 35053.4647930843. The cubic root of 1228745394 is about 1071.0768539869.

The spelling of 1228745394 in words is "one billion, two hundred twenty-eight million, seven hundred forty-five thousand, three hundred ninety-four".