43476421 has 2 divisors, whose sum is σ = 43476422. Its totient is φ = 43476420.

The previous prime is 43476413. The next prime is 43476431. The reversal of 43476421 is 12467434.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 39125025 + 4351396 = 6255^2 + 2086^2 .

It is a cyclic number.

It is not a de Polignac number, because 43476421 - 2³ = 43476413 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43476431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21738210 + 21738211.

It is an arithmetic number, because the mean of its divisors is an integer number (21738211).

Almost surely, 2^43476421 is an apocalyptic number.

It is an amenable number.

43476421 is a deficient number, since it is larger than the sum of its proper divisors (1).

43476421 is an equidigital number, since it uses as much as digits as its factorization.

43476421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16128, while the sum is 31.

The square root of 43476421 is about 6593.6652174644. The cubic root of 43476421 is about 351.6289268166.

The spelling of 43476421 in words is "forty-three million, four hundred seventy-six thousand, four hundred twenty-one".