1211740440 has 64 divisors (see below), whose sum is σ = 3656296800. Its totient is φ = 321257472.

The previous prime is 1211740403. The next prime is 1211740451. The reversal of 1211740440 is 440471121.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 1211740440.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8425 + ... + 49944.

Almost surely, 2^1211740440 is an apocalyptic number.

1211740440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1211740440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1828148400).

1211740440 is an abundant number, since it is smaller than the sum of its proper divisors (2444556360).

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

1211740440 is a wasteful number, since it uses less digits than its factorization.

1211740440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58556 (or 58552 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 24.

The square root of 1211740440 is about 34810.0623383527. The cubic root of 1211740440 is about 1066.1129057066.

The spelling of 1211740440 in words is "one billion, two hundred eleven million, seven hundred forty thousand, four hundred forty".