1257380 has 12 divisors (see below), whose sum is σ = 2640540. Its totient is φ = 502944.

The previous prime is 1257359. The next prime is 1257397. The reversal of 1257380 is 837521.

It can be written as a sum of positive squares in 2 ways, for example, as 320356 + 937024 = 566^2 + 968^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31415 + ... + 31454.

It is an arithmetic number, because the mean of its divisors is an integer number (220045).

2^1257380 is an apocalyptic number.

1257380 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1257380 is an abundant number, since it is smaller than the sum of its proper divisors (1383160).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1257380 is a wasteful number, since it uses less digits than its factorization.

1257380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62878 (or 62876 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 26.

The square root of 1257380 is about 1121.3295679683. The cubic root of 1257380 is about 107.9333150293.

The spelling of 1257380 in words is "one million, two hundred fifty-seven thousand, three hundred eighty".