1211432140 has 12 divisors (see below), whose sum is σ = 2544007536. Its totient is φ = 484572848.

The previous prime is 1211432099. The next prime is 1211432143. The reversal of 1211432140 is 412341121.

It is a super-3 number, since 3×1211432140³ (a number of 28 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (1211432143) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30285784 + ... + 30285823.

It is an arithmetic number, because the mean of its divisors is an integer number (212000628).

Almost surely, 2^1211432140 is an apocalyptic number.

1211432140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1211432140 is an abundant number, since it is smaller than the sum of its proper divisors (1332575396).

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

1211432140 is a wasteful number, since it uses less digits than its factorization.

1211432140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60571616 (or 60571614 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 19.

The square root of 1211432140 is about 34805.6337393819. The cubic root of 1211432140 is about 1066.0224819169.

Adding to 1211432140 its reverse (412341121), we get a palindrome (1623773261).

The spelling of 1211432140 in words is "one billion, two hundred eleven million, four hundred thirty-two thousand, one hundred forty".