1213126040 has 64 divisors (see below), whose sum is σ = 3195581760. Its totient is φ = 405780480.

The previous prime is 1213126039. The next prime is 1213126043. The reversal of 1213126040 is 406213121.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213126043) 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, 41357 + ... + 64316.

It is an arithmetic number, because the mean of its divisors is an integer number (49930965).

Almost surely, 2^1213126040 is an apocalyptic number.

1213126040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1213126040 is an abundant number, since it is smaller than the sum of its proper divisors (1982455720).

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

1213126040 is a wasteful number, since it uses less digits than its factorization.

1213126040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105732 (or 105728 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 1213126040 is about 34829.9589434154. The cubic root of 1213126040 is about 1066.5191102312.

Adding to 1213126040 its reverse (406213121), we get a palindrome (1619339161).

The spelling of 1213126040 in words is "one billion, two hundred thirteen million, one hundred twenty-six thousand, forty".