43401403987 has 2 divisors, whose sum is σ = 43401403988. Its totient is φ = 43401403986.

The previous prime is 43401403979. The next prime is 43401404017. The reversal of 43401403987 is 78930410434.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 43401403987 - 2³ = 43401403979 is a prime.

It is not a weakly prime, because it can be changed into another prime (43401403187) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21700701993 + 21700701994.

It is an arithmetic number, because the mean of its divisors is an integer number (21700701994).

Almost surely, 2^43401403987 is an apocalyptic number.

43401403987 is a deficient number, since it is larger than the sum of its proper divisors (1).

43401403987 is an equidigital number, since it uses as much as digits as its factorization.

43401403987 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 290304, while the sum is 43.

The spelling of 43401403987 in words is "forty-three billion, four hundred one million, four hundred three thousand, nine hundred eighty-seven".