1211503040 has 56 divisors (see below), whose sum is σ = 3147163632. Its totient is φ = 440545280.

The previous prime is 1211503039. The next prime is 1211503091. The reversal of 1211503040 is 403051121.

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, 168569 + ... + 175608.

Almost surely, 2^1211503040 is an apocalyptic number.

1211503040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1211503040 is an abundant number, since it is smaller than the sum of its proper divisors (1935660592).

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

1211503040 is a wasteful number, since it uses less digits than its factorization.

1211503040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 344205 (or 344195 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 17.

The square root of 1211503040 is about 34806.6522377548. The cubic root of 1211503040 is about 1066.0432781071.

Adding to 1211503040 its reverse (403051121), we get a palindrome (1614554161).

The spelling of 1211503040 in words is "one billion, two hundred eleven million, five hundred three thousand, forty".