261493938 has 12 divisors (see below), whose sum is σ = 566570238. Its totient is φ = 87164640.

The previous prime is 261493937. The next prime is 261493951. The reversal of 261493938 is 839394162.

It is a happy number.

261493938 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 222218649 + 39275289 = 14907^2 + 6267^2 .

It is a super-2 number, since 2×261493938² = 136758159221495688, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 261493893 and 261493902.

It is not an unprimeable number, because it can be changed into a prime (261493931) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 7263703 + ... + 7263738.

Almost surely, 2^261493938 is an apocalyptic number.

261493938 is an abundant number, since it is smaller than the sum of its proper divisors (305076300).

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

261493938 is a wasteful number, since it uses less digits than its factorization.

261493938 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14527449 (or 14527446 counting only the distinct ones).

The product of its digits is 279936, while the sum is 45.

The square root of 261493938 is about 16170.7741929692. The cubic root of 261493938 is about 639.4705402991.

The spelling of 261493938 in words is "two hundred sixty-one million, four hundred ninety-three thousand, nine hundred thirty-eight".