1229025540 has 96 divisors (see below), whose sum is σ = 3678079104. Its totient is φ = 305551360.

The previous prime is 1229025529. The next prime is 1229025541. The reversal of 1229025540 is 455209221.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 1229025498 and 1229025507.

It is not an unprimeable number, because it can be changed into a prime (1229025541) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 103510 + ... + 114770.

It is an arithmetic number, because the mean of its divisors is an integer number (38313324).

Almost surely, 2^1229025540 is an apocalyptic number.

1229025540 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 1229025540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1839039552).

1229025540 is an abundant number, since it is smaller than the sum of its proper divisors (2449053564).

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

1229025540 is a wasteful number, since it uses less digits than its factorization.

1229025540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11397 (or 11395 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 30.

The square root of 1229025540 is about 35057.4605469364. The cubic root of 1229025540 is about 1071.1582473325.

The spelling of 1229025540 in words is "one billion, two hundred twenty-nine million, twenty-five thousand, five hundred forty".