1219535140 has 48 divisors (see below), whose sum is σ = 2699827200. Its totient is φ = 461452032.

The previous prime is 1219535123. The next prime is 1219535147. The reversal of 1219535140 is 415359121.

It is not an unprimeable number, because it can be changed into a prime (1219535147) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 305437 + ... + 309403.

It is an arithmetic number, because the mean of its divisors is an integer number (56246400).

Almost surely, 2^1219535140 is an apocalyptic number.

1219535140 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 1219535140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1349913600).

1219535140 is an abundant number, since it is smaller than the sum of its proper divisors (1480292060).

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

1219535140 is a wasteful number, since it uses less digits than its factorization.

1219535140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4804 (or 4802 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 31.

The square root of 1219535140 is about 34921.8433075919. The cubic root of 1219535140 is about 1068.3939979543.

The spelling of 1219535140 in words is "one billion, two hundred nineteen million, five hundred thirty-five thousand, one hundred forty".