1211427340 has 24 divisors (see below), whose sum is σ = 2545788672. Its totient is φ = 484229760.

The previous prime is 1211427337. The next prime is 1211427377. The reversal of 1211427340 is 437241121.

It is a super-3 number, since 3×1211427340³ (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 7 ways as a sum of consecutive naturals, for example, 8832 + ... + 50008.

It is an arithmetic number, because the mean of its divisors is an integer number (106074528).

Almost surely, 2^1211427340 is an apocalyptic number.

1211427340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1211427340 is an abundant number, since it is smaller than the sum of its proper divisors (1334361332).

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

1211427340 is a wasteful number, since it uses less digits than its factorization.

1211427340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42657 (or 42655 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 25.

The square root of 1211427340 is about 34805.5647849593. The cubic root of 1211427340 is about 1066.0210739650.

Adding to 1211427340 its reverse (437241121), we get a palindrome (1648668461).

The spelling of 1211427340 in words is "one billion, two hundred eleven million, four hundred twenty-seven thousand, three hundred forty".