43990487 has 2 divisors, whose sum is σ = 43990488. Its totient is φ = 43990486.

The previous prime is 43990483. The next prime is 43990517. The reversal of 43990487 is 78409934.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 43990487 - 2² = 43990483 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43990483) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21995243 + 21995244.

It is an arithmetic number, because the mean of its divisors is an integer number (21995244).

Almost surely, 2^43990487 is an apocalyptic number.

43990487 is a deficient number, since it is larger than the sum of its proper divisors (1).

43990487 is an equidigital number, since it uses as much as digits as its factorization.

43990487 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 217728, while the sum is 44.

The square root of 43990487 is about 6632.5324725930. The cubic root of 43990487 is about 353.0093891202.

The spelling of 43990487 in words is "forty-three million, nine hundred ninety thousand, four hundred eighty-seven".