261764403 has 32 divisors (see below), whose sum is σ = 383201280. Its totient is φ = 158421120.

The previous prime is 261764339. The next prime is 261764417. The reversal of 261764403 is 304467162.

It is a happy number.

It is not a de Polignac number, because 261764403 - 2⁶ = 261764339 is a prime.

It is not an unprimeable number, because it can be changed into a prime (261764423) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 112213 + ... + 114521.

It is an arithmetic number, because the mean of its divisors is an integer number (11975040).

Almost surely, 2^261764403 is an apocalyptic number.

261764403 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

261764403 is a deficient number, since it is larger than the sum of its proper divisors (121436877).

261764403 is a wasteful number, since it uses less digits than its factorization.

261764403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2419.

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

The square root of 261764403 is about 16179.1348038144. The cubic root of 261764403 is about 639.6909339417.

The spelling of 261764403 in words is "two hundred sixty-one million, seven hundred sixty-four thousand, four hundred three".