1230521436 has 96 divisors (see below), whose sum is σ = 3363924480. Its totient is φ = 388219392.

The previous prime is 1230521431. The next prime is 1230521437. The reversal of 1230521436 is 6341250321.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1230521431) 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, 238395 + ... + 243501.

It is an arithmetic number, because the mean of its divisors is an integer number (35040880).

Almost surely, 2^1230521436 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1230521436, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1681962240).

1230521436 is an abundant number, since it is smaller than the sum of its proper divisors (2133403044).

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

1230521436 is a wasteful number, since it uses less digits than its factorization.

1230521436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5240 (or 5232 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The square root of 1230521436 is about 35078.7889756759. The cubic root of 1230521436 is about 1071.5926542761.

Adding to 1230521436 its reverse (6341250321), we get a palindrome (7571771757).

The spelling of 1230521436 in words is "one billion, two hundred thirty million, five hundred twenty-one thousand, four hundred thirty-six".