1271992 has 32 divisors (see below), whose sum is σ = 2580480. Its totient is φ = 586080.

The previous prime is 1271987. The next prime is 1271999. The reversal of 1271992 is 2991721.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1271999) 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, 5593 + ... + 5815.

It is an arithmetic number, because the mean of its divisors is an integer number (80640).

2^1271992 is an apocalyptic number.

It is an amenable number.

1271992 is an abundant number, since it is smaller than the sum of its proper divisors (1308488).

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

1271992 is a wasteful number, since it uses less digits than its factorization.

1271992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 283 (or 279 counting only the distinct ones).

The product of its digits is 2268, while the sum is 31.

The square root of 1271992 is about 1127.8262277496. The cubic root of 1271992 is about 108.3498031502.

The spelling of 1271992 in words is "one million, two hundred seventy-one thousand, nine hundred ninety-two".