1211596890 has 64 divisors (see below), whose sum is σ = 3326006016. Its totient is φ = 276705792.

The previous prime is 1211596889. The next prime is 1211596913. The reversal of 1211596890 is 986951121.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 488694 + ... + 491166.

It is an arithmetic number, because the mean of its divisors is an integer number (51968844).

Almost surely, 2^1211596890 is an apocalyptic number.

1211596890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1211596890 is an abundant number, since it is smaller than the sum of its proper divisors (2114409126).

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

1211596890 is a wasteful number, since it uses less digits than its factorization.

1211596890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4823.

The product of its (nonzero) digits is 38880, while the sum is 42.

The square root of 1211596890 is about 34808.0003734774. Note that the first 3 decimals coincide. The cubic root of 1211596890 is about 1066.0708046795.

The spelling of 1211596890 in words is "one billion, two hundred eleven million, five hundred ninety-six thousand, eight hundred ninety".