1211400040 has 16 divisors (see below), whose sum is σ = 2725650180. Its totient is φ = 484560000.

The previous prime is 1211400013. The next prime is 1211400061. The reversal of 1211400040 is 400041121.

It can be written as a sum of positive squares in 2 ways, for example, as 1127750724 + 83649316 = 33582^2 + 9146^2 .

It is a super-3 number, since 3×1211400040³ (a number of 28 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15142461 + ... + 15142540.

Almost surely, 2^1211400040 is an apocalyptic number.

1211400040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1211400040 is an abundant number, since it is smaller than the sum of its proper divisors (1514250140).

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

1211400040 is a wasteful number, since it uses less digits than its factorization.

1211400040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30285012 (or 30285008 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

The square root of 1211400040 is about 34805.1726040829. The cubic root of 1211400040 is about 1066.0130661677.

Adding to 1211400040 its reverse (400041121), we get a palindrome (1611441161).

The spelling of 1211400040 in words is "one billion, two hundred eleven million, four hundred thousand, forty".