1211465540 has 24 divisors (see below), whose sum is σ = 2606130072. Its totient is φ = 472766720.

The previous prime is 1211465533. The next prime is 1211465557. The reversal of 1211465540 is 455641121.

It can be written as a sum of positive squares in 4 ways, for example, as 11397376 + 1200068164 = 3376^2 + 34642^2 .

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, 737879 + ... + 739518.

It is an arithmetic number, because the mean of its divisors is an integer number (108588753).

Almost surely, 2^1211465540 is an apocalyptic number.

1211465540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1211465540 is an abundant number, since it is smaller than the sum of its proper divisors (1394664532).

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

1211465540 is a wasteful number, since it uses less digits than its factorization.

1211465540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1477447 (or 1477445 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 29.

The square root of 1211465540 is about 34806.1135434567. The cubic root of 1211465540 is about 1066.0322788128.

The spelling of 1211465540 in words is "one billion, two hundred eleven million, four hundred sixty-five thousand, five hundred forty".