1261426630 has 32 divisors (see below), whose sum is σ = 2351255040. Its totient is φ = 486675840.

The previous prime is 1261426603. The next prime is 1261426633. The reversal of 1261426630 is 366241621.

It is a junction number, because it is equal to n+sod(n) for n = 1261426592 and 1261426601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1261426633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 425112 + ... + 428068.

It is an arithmetic number, because the mean of its divisors is an integer number (73476720).

Almost surely, 2^1261426630 is an apocalyptic number.

1261426630 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1261426630 is a deficient number, since it is larger than the sum of its proper divisors (1089828410).

1261426630 is a wasteful number, since it uses less digits than its factorization.

1261426630 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4464.

The product of its (nonzero) digits is 10368, while the sum is 31.

The square root of 1261426630 is about 35516.5683871626. The cubic root of 1261426630 is about 1080.4897841346.

The spelling of 1261426630 in words is "one billion, two hundred sixty-one million, four hundred twenty-six thousand, six hundred thirty".