1271640 has 32 divisors (see below), whose sum is σ = 3815280. Its totient is φ = 339072.

The previous prime is 1271609. The next prime is 1271657. The reversal of 1271640 is 461721.

It is an Ulam number.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 5179 + ... + 5418.

2^1271640 is an apocalyptic number.

1271640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1271640 is an abundant number, since it is smaller than the sum of its proper divisors (2543640).

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

1271640 is a wasteful number, since it uses less digits than its factorization.

1271640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10611 (or 10607 counting only the distinct ones).

The product of its (nonzero) digits is 336, while the sum is 21.

The square root of 1271640 is about 1127.6701645428. The cubic root of 1271640 is about 108.3398076341.

The spelling of 1271640 in words is "one million, two hundred seventy-one thousand, six hundred forty".