1257218403 has 32 divisors (see below), whose sum is σ = 1944821760. Its totient is φ = 707559840.

The previous prime is 1257218401. The next prime is 1257218419. The reversal of 1257218403 is 3048127521.

It is not a de Polignac number, because 1257218403 - 2¹ = 1257218401 is a prime.

It is a super-2 number, since 2×1257218403² = 3161196225683740818, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1257218401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 973188 + ... + 974478.

It is an arithmetic number, because the mean of its divisors is an integer number (60775680).

Almost surely, 2^1257218403 is an apocalyptic number.

1257218403 is a deficient number, since it is larger than the sum of its proper divisors (687603357).

1257218403 is a wasteful number, since it uses less digits than its factorization.

1257218403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1967.

The product of its (nonzero) digits is 13440, while the sum is 33.

The square root of 1257218403 is about 35457.2757413764. The cubic root of 1257218403 is about 1079.2869101028.

The spelling of 1257218403 in words is "one billion, two hundred fifty-seven million, two hundred eighteen thousand, four hundred three".