42023491 has 2 divisors, whose sum is σ = 42023492. Its totient is φ = 42023490.

The previous prime is 42023479. The next prime is 42023521. The reversal of 42023491 is 19432024.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 42023491 - 2⁷ = 42023363 is a prime.

It is not a weakly prime, because it can be changed into another prime (42023431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21011745 + 21011746.

It is an arithmetic number, because the mean of its divisors is an integer number (21011746).

Almost surely, 2^42023491 is an apocalyptic number.

42023491 is a deficient number, since it is larger than the sum of its proper divisors (1).

42023491 is an equidigital number, since it uses as much as digits as its factorization.

42023491 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 42023491 is about 6482.5528150567. The cubic root of 42023491 is about 347.6674582371.

The spelling of 42023491 in words is "forty-two million, twenty-three thousand, four hundred ninety-one".