1257220215 has 48 divisors (see below), whose sum is σ = 2303009280. Its totient is φ = 632698560.

The previous prime is 1257220213. The next prime is 1257220229. The reversal of 1257220215 is 5120227521.

It is not a de Polignac number, because 1257220215 - 2¹ = 1257220213 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1257220213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 222070 + ... + 227660.

It is an arithmetic number, because the mean of its divisors is an integer number (47979360).

Almost surely, 2^1257220215 is an apocalyptic number.

1257220215 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1257220215 is a deficient number, since it is larger than the sum of its proper divisors (1045789065).

1257220215 is a wasteful number, since it uses less digits than its factorization.

1257220215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5884 (or 5881 counting only the distinct ones).

The product of its (nonzero) digits is 2800, while the sum is 27.

The square root of 1257220215 is about 35457.3012932457. The cubic root of 1257220215 is about 1079.2874286197.

Adding to 1257220215 its reverse (5120227521), we get a palindrome (6377447736).

The spelling of 1257220215 in words is "one billion, two hundred fifty-seven million, two hundred twenty thousand, two hundred fifteen".