40030421 has 2 divisors, whose sum is σ = 40030422. Its totient is φ = 40030420.

The previous prime is 40030399. The next prime is 40030429. The reversal of 40030421 is 12403004.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23716900 + 16313521 = 4870^2 + 4039^2 .

It is a cyclic number.

It is not a de Polignac number, because 40030421 - 2⁶ = 40030357 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 40030396 and 40030405.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40030429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20015210 + 20015211.

It is an arithmetic number, because the mean of its divisors is an integer number (20015211).

Almost surely, 2^40030421 is an apocalyptic number.

It is an amenable number.

40030421 is a deficient number, since it is larger than the sum of its proper divisors (1).

40030421 is an equidigital number, since it uses as much as digits as its factorization.

40030421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96, while the sum is 14.

The square root of 40030421 is about 6326.9598544641. The cubic root of 40030421 is about 342.0818659963.

Adding to 40030421 its reverse (12403004), we get a palindrome (52433425).

The spelling of 40030421 in words is "forty million, thirty thousand, four hundred twenty-one".