42999623 has 2 divisors, whose sum is σ = 42999624. Its totient is φ = 42999622.

The previous prime is 42999601. The next prime is 42999629. The reversal of 42999623 is 32699924.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 42999623 - 2⁸ = 42999367 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42999629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21499811 + 21499812.

It is an arithmetic number, because the mean of its divisors is an integer number (21499812).

Almost surely, 2^42999623 is an apocalyptic number.

42999623 is a deficient number, since it is larger than the sum of its proper divisors (1).

42999623 is an equidigital number, since it uses as much as digits as its factorization.

42999623 is an evil number, because the sum of its binary digits is even.

The product of its digits is 209952, while the sum is 44.

The square root of 42999623 is about 6557.4097782585. The cubic root of 42999623 is about 350.3387821744.

The spelling of 42999623 in words is "forty-two million, nine hundred ninety-nine thousand, six hundred twenty-three".