1261630 has 16 divisors (see below), whose sum is σ = 2301120. Its totient is φ = 497952.

The previous prime is 1261627. The next prime is 1261639. The reversal of 1261630 is 361621.

It is a junction number, because it is equal to n+sod(n) for n = 1261598 and 1261607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1261639) 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, 9 + ... + 1588.

It is an arithmetic number, because the mean of its divisors is an integer number (143820).

2^1261630 is an apocalyptic number.

1261630 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1261630 is a deficient number, since it is larger than the sum of its proper divisors (1039490).

1261630 is a wasteful number, since it uses less digits than its factorization.

1261630 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1683.

The product of its (nonzero) digits is 216, while the sum is 19.

The square root of 1261630 is about 1123.2230410742. The cubic root of 1261630 is about 108.0547847334.

Subtracting from 1261630 its reverse (361621), we obtain a palindrome (900009).

It can be divided in two parts, 1261 and 630, that multiplied together give a triangular number (794430 = T₁₂₆₀).

The spelling of 1261630 in words is "one million, two hundred sixty-one thousand, six hundred thirty".