1257115403 has 4 divisors (see below), whose sum is σ = 1300464240. Its totient is φ = 1213766568.

The previous prime is 1257115369. The next prime is 1257115451. The reversal of 1257115403 is 3045117521.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1257115403 - 2⁸ = 1257115147 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29), and also a Moran number because the ratio is a prime number: 43348807 = 1257115403 / (1 + 2 + 5 + 7 + 1 + 1 + 5 + 4 + 0 + 3).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1257115463) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21674375 + ... + 21674432.

It is an arithmetic number, because the mean of its divisors is an integer number (325116060).

Almost surely, 2^1257115403 is an apocalyptic number.

1257115403 is a deficient number, since it is larger than the sum of its proper divisors (43348837).

1257115403 is an equidigital number, since it uses as much as digits as its factorization.

1257115403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43348836.

The product of its (nonzero) digits is 4200, while the sum is 29.

The square root of 1257115403 is about 35455.8232593745. The cubic root of 1257115403 is about 1079.2574350894.

The spelling of 1257115403 in words is "one billion, two hundred fifty-seven million, one hundred fifteen thousand, four hundred three".