40389487 has 2 divisors, whose sum is σ = 40389488. Its totient is φ = 40389486.

The previous prime is 40389473. The next prime is 40389509. The reversal of 40389487 is 78498304.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 40389487 - 2⁷ = 40389359 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40389407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20194743 + 20194744.

It is an arithmetic number, because the mean of its divisors is an integer number (20194744).

Almost surely, 2^40389487 is an apocalyptic number.

40389487 is a deficient number, since it is larger than the sum of its proper divisors (1).

40389487 is an equidigital number, since it uses as much as digits as its factorization.

40389487 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 193536, while the sum is 43.

The square root of 40389487 is about 6355.2723781125. The cubic root of 40389487 is about 343.1016282080.

The spelling of 40389487 in words is "forty million, three hundred eighty-nine thousand, four hundred eighty-seven".