1213277740 has 48 divisors (see below), whose sum is σ = 2665643904. Its totient is φ = 463385600.

The previous prime is 1213277731. The next prime is 1213277771. The reversal of 1213277740 is 477723121.

It is a junction number, because it is equal to n+sod(n) for n = 1213277696 and 1213277705.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22800 + ... + 54280.

It is an arithmetic number, because the mean of its divisors is an integer number (55534248).

Almost surely, 2^1213277740 is an apocalyptic number.

1213277740 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 1213277740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1332821952).

1213277740 is an abundant number, since it is smaller than the sum of its proper divisors (1452366164).

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

1213277740 is a wasteful number, since it uses less digits than its factorization.

1213277740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31578 (or 31576 counting only the distinct ones).

The product of its (nonzero) digits is 16464, while the sum is 34.

The square root of 1213277740 is about 34832.1365982622. The cubic root of 1213277740 is about 1066.5635640363.

The spelling of 1213277740 in words is "one billion, two hundred thirteen million, two hundred seventy-seven thousand, seven hundred forty".