1212405655 has 16 divisors (see below), whose sum is σ = 1497222144. Its totient is φ = 942017440.

The previous prime is 1212405641. The next prime is 1212405661. The reversal of 1212405655 is 5565042121.

It is not a de Polignac number, because 1212405655 - 2¹⁹ = 1211881367 is a prime.

It is a Duffinian number.

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, 11094 + ... + 50476.

It is an arithmetic number, because the mean of its divisors is an integer number (93576384).

Almost surely, 2^1212405655 is an apocalyptic number.

1212405655 is a deficient number, since it is larger than the sum of its proper divisors (284816489).

1212405655 is a wasteful number, since it uses less digits than its factorization.

1212405655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39566.

The product of its (nonzero) digits is 12000, while the sum is 31.

The square root of 1212405655 is about 34819.6159513571. The cubic root of 1212405655 is about 1066.3079597342.

Adding to 1212405655 its reverse (5565042121), we get a palindrome (6777447776).

The spelling of 1212405655 in words is "one billion, two hundred twelve million, four hundred five thousand, six hundred fifty-five".