1257209855 has 16 divisors (see below), whose sum is σ = 1685946528. Its totient is φ = 892032000.

The previous prime is 1257209813. The next prime is 1257209861. The reversal of 1257209855 is 5589027521.

It is not a de Polignac number, because 1257209855 - 2⁸ = 1257209599 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, 276506 + ... + 281015.

It is an arithmetic number, because the mean of its divisors is an integer number (105371658).

Almost surely, 2^1257209855 is an apocalyptic number.

1257209855 is a deficient number, since it is larger than the sum of its proper divisors (428736673).

1257209855 is a wasteful number, since it uses less digits than its factorization.

1257209855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 557578.

The product of its (nonzero) digits is 252000, while the sum is 44.

The square root of 1257209855 is about 35457.1552017361. The cubic root of 1257209855 is about 1079.2844640241.

It can be divided in two parts, 1257 and 209855, that added together give a palindrome (211112).

The spelling of 1257209855 in words is "one billion, two hundred fifty-seven million, two hundred nine thousand, eight hundred fifty-five".