1257015 has 16 divisors (see below), whose sum is σ = 2055168. Its totient is φ = 655776.

The previous prime is 1257013. The next prime is 1257017. The reversal of 1257015 is 5107521.

It is an interprime number because it is at equal distance from previous prime (1257013) and next prime (1257017).

It is not a de Polignac number, because 1257015 - 2¹ = 1257013 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1256982 and 1257000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1257013) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 187 + ... + 1596.

It is an arithmetic number, because the mean of its divisors is an integer number (128448).

2^1257015 is an apocalyptic number.

1257015 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1257015 is a deficient number, since it is larger than the sum of its proper divisors (798153).

1257015 is a wasteful number, since it uses less digits than its factorization.

1257015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1838.

The product of its (nonzero) digits is 350, while the sum is 21.

The square root of 1257015 is about 1121.1668029334. The cubic root of 1257015 is about 107.9228701697.

It can be divided in two parts, 125 and 7015, that added together give a triangular number (7140 = T₁₁₉).

The spelling of 1257015 in words is "one million, two hundred fifty-seven thousand, fifteen".