1261421830 has 8 divisors (see below), whose sum is σ = 2270559312. Its totient is φ = 504568728.

The previous prime is 1261421809. The next prime is 1261421851. The reversal of 1261421830 is 381241621.

It is an interprime number because it is at equal distance from previous prime (1261421809) and next prime (1261421851).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 63071082 + ... + 63071101.

It is an arithmetic number, because the mean of its divisors is an integer number (283819914).

Almost surely, 2^1261421830 is an apocalyptic number.

1261421830 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1261421830 is a deficient number, since it is larger than the sum of its proper divisors (1009137482).

1261421830 is a wasteful number, since it uses less digits than its factorization.

1261421830 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126142190.

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 1261421830 is about 35516.5008130024. The cubic root of 1261421830 is about 1080.4884136341.

The spelling of 1261421830 in words is "one billion, two hundred sixty-one million, four hundred twenty-one thousand, eight hundred thirty".