1261842238 has 16 divisors (see below), whose sum is σ = 2091238560. Its totient is φ = 567990016.

The previous prime is 1261842233. The next prime is 1261842247. The reversal of 1261842238 is 8322481621.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 1261842197 and 1261842206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1261842233) 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, 806023 + ... + 807586.

It is an arithmetic number, because the mean of its divisors is an integer number (130702410).

Almost surely, 2^1261842238 is an apocalyptic number.

1261842238 is a deficient number, since it is larger than the sum of its proper divisors (829396322).

1261842238 is a wasteful number, since it uses less digits than its factorization.

1261842238 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1613651.

The product of its digits is 36864, while the sum is 37.

The square root of 1261842238 is about 35522.4188084089. The cubic root of 1261842238 is about 1080.6084357413.

The spelling of 1261842238 in words is "one billion, two hundred sixty-one million, eight hundred forty-two thousand, two hundred thirty-eight".