1261290 has 16 divisors (see below), whose sum is σ = 3027168. Its totient is φ = 336336.

The previous prime is 1261289. The next prime is 1261301. The reversal of 1261290 is 921621.

It is a super-3 number, since 3×1261290³ = 6019578913334067000, which contains 333 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20992 + ... + 21051.

It is an arithmetic number, because the mean of its divisors is an integer number (189198).

2^1261290 is an apocalyptic number.

1261290 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1261290 is an abundant number, since it is smaller than the sum of its proper divisors (1765878).

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

1261290 is a wasteful number, since it uses less digits than its factorization.

1261290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42053.

The product of its (nonzero) digits is 216, while the sum is 21.

The square root of 1261290 is about 1123.0716807043. The cubic root of 1261290 is about 108.0450772049.

It can be divided in two parts, 1261 and 290, that added together give a palindrome (1551).

The spelling of 1261290 in words is "one million, two hundred sixty-one thousand, two hundred ninety".