30400861 has 2 divisors, whose sum is σ = 30400862. Its totient is φ = 30400860.

The previous prime is 30400837. The next prime is 30400873. The reversal of 30400861 is 16800403.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24304900 + 6095961 = 4930^2 + 2469^2 .

It is a cyclic number.

It is not a de Polignac number, because 30400861 - 2¹¹ = 30398813 is a prime.

It is a nialpdrome in base 12.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (30400891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15200430 + 15200431.

It is an arithmetic number, because the mean of its divisors is an integer number (15200431).

Almost surely, 2^30400861 is an apocalyptic number.

It is an amenable number.

30400861 is a deficient number, since it is larger than the sum of its proper divisors (1).

30400861 is an equidigital number, since it uses as much as digits as its factorization.

30400861 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 30400861 is about 5513.6975796647. The cubic root of 30400861 is about 312.1010965667.

The spelling of 30400861 in words is "thirty million, four hundred thousand, eight hundred sixty-one".