1228770140 has 48 divisors (see below), whose sum is σ = 2791504128. Its totient is φ = 451643904.

The previous prime is 1228770139. The next prime is 1228770161. The reversal of 1228770140 is 410778221.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 1228770097 and 1228770106.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 47384 + ... + 68576.

It is an arithmetic number, because the mean of its divisors is an integer number (58156336).

Almost surely, 2^1228770140 is an apocalyptic number.

1228770140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1228770140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1395752064).

1228770140 is an abundant number, since it is smaller than the sum of its proper divisors (1562733988).

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

1228770140 is a wasteful number, since it uses less digits than its factorization.

1228770140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21438 (or 21436 counting only the distinct ones).

The product of its (nonzero) digits is 6272, while the sum is 32.

The square root of 1228770140 is about 35053.8177664003. The cubic root of 1228770140 is about 1071.0840441637.

The spelling of 1228770140 in words is "one billion, two hundred twenty-eight million, seven hundred seventy thousand, one hundred forty".