1257238403 has 2 divisors, whose sum is σ = 1257238404. Its totient is φ = 1257238402.

The previous prime is 1257238327. The next prime is 1257238441. The reversal of 1257238403 is 3048327521.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1257238403 - 2²² = 1253044099 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (1257234403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 628619201 + 628619202.

It is an arithmetic number, because the mean of its divisors is an integer number (628619202).

Almost surely, 2^1257238403 is an apocalyptic number.

1257238403 is a deficient number, since it is larger than the sum of its proper divisors (1).

1257238403 is an equidigital number, since it uses as much as digits as its factorization.

1257238403 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 40320, while the sum is 35.

The square root of 1257238403 is about 35457.5577698183. The cubic root of 1257238403 is about 1079.2926332197.

The spelling of 1257238403 in words is "one billion, two hundred fifty-seven million, two hundred thirty-eight thousand, four hundred three".