1270890 has 48 divisors (see below), whose sum is σ = 3433248. Its totient is φ = 338256.

The previous prime is 1270879. The next prime is 1270897. The reversal of 1270890 is 980721.

It is a super-2 number, since 2×1270890² = 3230322784200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (1270897) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2169 + ... + 2691.

It is an arithmetic number, because the mean of its divisors is an integer number (71526).

2^1270890 is an apocalyptic number.

1270890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1270890, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1716624).

1270890 is an abundant number, since it is smaller than the sum of its proper divisors (2162358).

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

1270890 is an equidigital number, since it uses as much as digits as its factorization.

1270890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 545 (or 533 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 27.

The square root of 1270890 is about 1127.3375714488. The cubic root of 1270890 is about 108.3185042161.

The spelling of 1270890 in words is "one million, two hundred seventy thousand, eight hundred ninety".