261723426 has 8 divisors (see below), whose sum is σ = 523446864. Its totient is φ = 87241140.

The previous prime is 261723419. The next prime is 261723439. The reversal of 261723426 is 624327162.

261723426 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

261723426 is an admirable number.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is a nialpdrome in base 16.

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, 21810280 + ... + 21810291.

It is an arithmetic number, because the mean of its divisors is an integer number (65430858).

Almost surely, 2^261723426 is an apocalyptic number.

261723426 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

261723426 is a wasteful number, since it uses less digits than its factorization.

261723426 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43620576.

The product of its digits is 24192, while the sum is 33.

The square root of 261723426 is about 16177.8684009977. The cubic root of 261723426 is about 639.6575528008.

The spelling of 261723426 in words is "two hundred sixty-one million, seven hundred twenty-three thousand, four hundred twenty-six".