1228489642 has 16 divisors (see below), whose sum is σ = 1891616832. Its totient is φ = 598013280.

The previous prime is 1228489621. The next prime is 1228489663. The reversal of 1228489642 is 2469848221.

It is an interprime number because it is at equal distance from previous prime (1228489621) and next prime (1228489663).

It is a junction number, because it is equal to n+sod(n) for n = 1228489592 and 1228489601.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24553 + ... + 55315.

It is an arithmetic number, because the mean of its divisors is an integer number (118226052).

Almost surely, 2^1228489642 is an apocalyptic number.

1228489642 is a deficient number, since it is larger than the sum of its proper divisors (663127190).

1228489642 is a wasteful number, since it uses less digits than its factorization.

1228489642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31293.

The product of its digits is 442368, while the sum is 46.

The square root of 1228489642 is about 35049.8165758396. The cubic root of 1228489642 is about 1071.0025372471.

It can be divided in two parts, 12284 and 89642, that added together give a triangular number (101926 = T₄₅₁).

The spelling of 1228489642 in words is "one billion, two hundred twenty-eight million, four hundred eighty-nine thousand, six hundred forty-two".