30405261 has 4 divisors (see below), whose sum is σ = 40540352. Its totient is φ = 20270172.

The previous prime is 30405259. The next prime is 30405281. The reversal of 30405261 is 16250403.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 30405261 - 2¹ = 30405259 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30405211) 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, 5067541 + ... + 5067546.

It is an arithmetic number, because the mean of its divisors is an integer number (10135088).

Almost surely, 2^30405261 is an apocalyptic number.

It is an amenable number.

30405261 is a deficient number, since it is larger than the sum of its proper divisors (10135091).

30405261 is a wasteful number, since it uses less digits than its factorization.

30405261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10135090.

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 30405261 is about 5514.0965715156. The cubic root of 30405261 is about 312.1161529229.

Adding to 30405261 its reverse (16250403), we get a palindrome (46655664).

The spelling of 30405261 in words is "thirty million, four hundred five thousand, two hundred sixty-one".