1258640 has 20 divisors (see below), whose sum is σ = 2926524. Its totient is φ = 503424.

The previous prime is 1258639. The next prime is 1258643. The reversal of 1258640 is 468521.

It can be written as a sum of positive squares in 2 ways, for example, as 274576 + 984064 = 524^2 + 992^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a hoax number, since the sum of its digits (26) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (1258643) 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, 7787 + ... + 7946.

2^1258640 is an apocalyptic number.

1258640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1258640 is an abundant number, since it is smaller than the sum of its proper divisors (1667884).

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

1258640 is a wasteful number, since it uses less digits than its factorization.

1258640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15746 (or 15740 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 26.

The square root of 1258640 is about 1121.8912603278. The cubic root of 1258640 is about 107.9693557319.

The spelling of 1258640 in words is "one million, two hundred fifty-eight thousand, six hundred forty".