30400581 has 4 divisors (see below), whose sum is σ = 40534112. Its totient is φ = 20267052.

The previous prime is 30400571. The next prime is 30400597. The reversal of 30400581 is 18500403.

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 30400581 - 2⁷ = 30400453 is a prime.

It is a super-2 number, since 2×30400581² = 1848390650275122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30400501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5066761 + ... + 5066766.

It is an arithmetic number, because the mean of its divisors is an integer number (10133528).

Almost surely, 2^30400581 is an apocalyptic number.

It is an amenable number.

30400581 is a deficient number, since it is larger than the sum of its proper divisors (10133531).

30400581 is a wasteful number, since it uses less digits than its factorization.

30400581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10133530.

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 30400581 is about 5513.6721882970. The cubic root of 30400581 is about 312.1001383858.

Adding to 30400581 its reverse (18500403), we get a palindrome (48900984).

The spelling of 30400581 in words is "thirty million, four hundred thousand, five hundred eighty-one".