1235213540 has 48 divisors (see below), whose sum is σ = 2996227584. Its totient is φ = 422745600.

The previous prime is 1235213527. The next prime is 1235213549. The reversal of 1235213540 is 453125321.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (1235213549) 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, 161396 + ... + 168875.

It is an arithmetic number, because the mean of its divisors is an integer number (62421408).

Almost surely, 2^1235213540 is an apocalyptic number.

1235213540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1235213540 is an abundant number, since it is smaller than the sum of its proper divisors (1761014044).

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

1235213540 is a wasteful number, since it uses less digits than its factorization.

1235213540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 330308 (or 330306 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 26.

The square root of 1235213540 is about 35145.6048461255. The cubic root of 1235213540 is about 1072.9529575173.

Adding to 1235213540 its reverse (453125321), we get a palindrome (1688338861).

The spelling of 1235213540 in words is "one billion, two hundred thirty-five million, two hundred thirteen thousand, five hundred forty".