42990400639 has 2 divisors, whose sum is σ = 42990400640. Its totient is φ = 42990400638.

The previous prime is 42990400561. The next prime is 42990400667. The reversal of 42990400639 is 93600409924.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 42990400639 - 2⁹ = 42990400127 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42990407639) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21495200319 + 21495200320.

It is an arithmetic number, because the mean of its divisors is an integer number (21495200320).

Almost surely, 2^42990400639 is an apocalyptic number.

42990400639 is a deficient number, since it is larger than the sum of its proper divisors (1).

42990400639 is an equidigital number, since it uses as much as digits as its factorization.

42990400639 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 419904, while the sum is 46.

The spelling of 42990400639 in words is "forty-two billion, nine hundred ninety million, four hundred thousand, six hundred thirty-nine".