261342406 has 8 divisors (see below), whose sum is σ = 422168544. Its totient is φ = 120619560.

The previous prime is 261342401. The next prime is 261342413. The reversal of 261342406 is 604243162.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261342401) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5025790 + ... + 5025841.

It is an arithmetic number, because the mean of its divisors is an integer number (52771068).

Almost surely, 2^261342406 is an apocalyptic number.

261342406 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

261342406 is a deficient number, since it is larger than the sum of its proper divisors (160826138).

261342406 is a wasteful number, since it uses less digits than its factorization.

261342406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10051646.

The product of its (nonzero) digits is 6912, while the sum is 28.

The square root of 261342406 is about 16166.0881477245. The cubic root of 261342406 is about 639.3469950853.

Adding to 261342406 its reverse (604243162), we get a palindrome (865585568).

The spelling of 261342406 in words is "two hundred sixty-one million, three hundred forty-two thousand, four hundred six".