1211023840 has 48 divisors (see below), whose sum is σ = 3081129408. Its totient is φ = 447146496.

The previous prime is 1211023837. The next prime is 1211023901. The reversal of 1211023840 is 483201121.

It is a happy number.

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, 289032 + ... + 293191.

It is an arithmetic number, because the mean of its divisors is an integer number (64190196).

Almost surely, 2^1211023840 is an apocalyptic number.

1211023840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1211023840 is an abundant number, since it is smaller than the sum of its proper divisors (1870105568).

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

1211023840 is a wasteful number, since it uses less digits than its factorization.

1211023840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 582251 (or 582243 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 22.

The square root of 1211023840 is about 34799.7678153174. The cubic root of 1211023840 is about 1065.9027047062.

Adding to 1211023840 its reverse (483201121), we get a palindrome (1694224961).

The spelling of 1211023840 in words is "one billion, two hundred eleven million, twenty-three thousand, eight hundred forty".