1270640 has 40 divisors (see below), whose sum is σ = 3377760. Its totient is φ = 435456.

The previous prime is 1270639. The next prime is 1270649. The reversal of 1270640 is 460721.

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×1270640² = 3229052019200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1270649) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 575 + ... + 1694.

It is an arithmetic number, because the mean of its divisors is an integer number (84444).

2^1270640 is an apocalyptic number.

1270640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1270640 is an abundant number, since it is smaller than the sum of its proper divisors (2107120).

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

1270640 is a wasteful number, since it uses less digits than its factorization.

1270640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2289 (or 2283 counting only the distinct ones).

The product of its (nonzero) digits is 336, while the sum is 20.

The square root of 1270640 is about 1127.2266852767. The cubic root of 1270640 is about 108.3114012143.

The spelling of 1270640 in words is "one million, two hundred seventy thousand, six hundred forty".