1211490540 has 384 divisors, whose sum is σ = 4425523200. Its totient is φ = 272471040.

The previous prime is 1211490503. The next prime is 1211490587. The reversal of 1211490540 is 450941121.

1211490540 is a `hidden beast` number, since 1 + 2 + 114 + 9 + 0 + 540 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 4134634 + ... + 4134926.

It is an arithmetic number, because the mean of its divisors is an integer number (11524800).

Almost surely, 2^1211490540 is an apocalyptic number.

1211490540 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 1211490540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2212761600).

1211490540 is an abundant number, since it is smaller than the sum of its proper divisors (3214032660).

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

1211490540 is a wasteful number, since it uses less digits than its factorization.

1211490540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 374 (or 366 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 27.

The square root of 1211490540 is about 34806.4726739151. The cubic root of 1211490540 is about 1066.0396117009.

The spelling of 1211490540 in words is "one billion, two hundred eleven million, four hundred ninety thousand, five hundred forty".