1228739640 has 64 divisors (see below), whose sum is σ = 3708892800. Its totient is φ = 325648512.

The previous prime is 1228739581. The next prime is 1228739641. The reversal of 1228739640 is 469378221.

It is a super-2 number, since 2×1228739640² = 3019602205814659200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1228739592 and 1228739601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1228739641) 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 in 15 ways as a sum of consecutive naturals, for example, 11850 + ... + 50969.

It is an arithmetic number, because the mean of its divisors is an integer number (57951450).

Almost surely, 2^1228739640 is an apocalyptic number.

1228739640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1228739640 is an abundant number, since it is smaller than the sum of its proper divisors (2480153160).

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

1228739640 is a wasteful number, since it uses less digits than its factorization.

1228739640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62996 (or 62992 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 42.

The square root of 1228739640 is about 35053.3827183626. The cubic root of 1228739640 is about 1071.0751820957.

The spelling of 1228739640 in words is "one billion, two hundred twenty-eight million, seven hundred thirty-nine thousand, six hundred forty".