1213542140 has 24 divisors (see below), whose sum is σ = 2549504832. Its totient is φ = 485213760.

The previous prime is 1213542107. The next prime is 1213542157. The reversal of 1213542140 is 412453121.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42062 + ... + 64778.

It is an arithmetic number, because the mean of its divisors is an integer number (106229368).

Almost surely, 2^1213542140 is an apocalyptic number.

1213542140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1213542140 is an abundant number, since it is smaller than the sum of its proper divisors (1335962692).

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

1213542140 is a wasteful number, since it uses less digits than its factorization.

1213542140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25397 (or 25395 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 1213542140 is about 34835.9317372164. The cubic root of 1213542140 is about 1066.6410343233.

Adding to 1213542140 its reverse (412453121), we get a palindrome (1625995261).

The spelling of 1213542140 in words is "one billion, two hundred thirteen million, five hundred forty-two thousand, one hundred forty".