1257455 has 4 divisors (see below), whose sum is σ = 1508952. Its totient is φ = 1005960.

The previous prime is 1257437. The next prime is 1257457. The reversal of 1257455 is 5547521.

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

It is not a de Polignac number, because 1257455 - 2⁸ = 1257199 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1257457) 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, 125741 + ... + 125750.

It is an arithmetic number, because the mean of its divisors is an integer number (377238).

2^1257455 is an apocalyptic number.

1257455 is a deficient number, since it is larger than the sum of its proper divisors (251497).

1257455 is an equidigital number, since it uses as much as digits as its factorization.

1257455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 251496.

The product of its digits is 7000, while the sum is 29.

The square root of 1257455 is about 1121.3630099125. The cubic root of 1257455 is about 107.9354609830.

The spelling of 1257455 in words is "one million, two hundred fifty-seven thousand, four hundred fifty-five".