1211645740 has 24 divisors (see below), whose sum is σ = 2551293360. Its totient is φ = 483355968.

The previous prime is 1211645719. The next prime is 1211645741. The reversal of 1211645740 is 475461121.

It is not an unprimeable number, because it can be changed into a prime (1211645741) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 73750 + ... + 88669.

It is an arithmetic number, because the mean of its divisors is an integer number (106303890).

Almost surely, 2^1211645740 is an apocalyptic number.

1211645740 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1211645740 is an abundant number, since it is smaller than the sum of its proper divisors (1339647620).

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

1211645740 is a wasteful number, since it uses less digits than its factorization.

1211645740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162801 (or 162799 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 31.

The square root of 1211645740 is about 34808.7020729013. The cubic root of 1211645740 is about 1066.0851320132.

The spelling of 1211645740 in words is "one billion, two hundred eleven million, six hundred forty-five thousand, seven hundred forty".