261226404 has 48 divisors (see below), whose sum is σ = 678888000. Its totient is φ = 86865408.

The previous prime is 261226393. The next prime is 261226411. The reversal of 261226404 is 404622162.

261226404 is a `hidden beast` number, since 2 + 6 + 12 + 2 + 640 + 4 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 45799 + ... + 51185.

It is an arithmetic number, because the mean of its divisors is an integer number (14143500).

Almost surely, 2^261226404 is an apocalyptic number.

It is an amenable number.

261226404 is an abundant number, since it is smaller than the sum of its proper divisors (417661596).

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

261226404 is a wasteful number, since it uses less digits than its factorization.

261226404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5849 (or 5841 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 27.

The square root of 261226404 is about 16162.4999303944. The cubic root of 261226404 is about 639.2523854794.

Adding to 261226404 its reverse (404622162), we get a palindrome (665848566).

The spelling of 261226404 in words is "two hundred sixty-one million, two hundred twenty-six thousand, four hundred four".