42670387 has 2 divisors, whose sum is σ = 42670388. Its totient is φ = 42670386.

The previous prime is 42670367. The next prime is 42670403. The reversal of 42670387 is 78307624.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 42670387 - 2¹⁵ = 42637619 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (42670367) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21335193 + 21335194.

It is an arithmetic number, because the mean of its divisors is an integer number (21335194).

Almost surely, 2^42670387 is an apocalyptic number.

42670387 is a deficient number, since it is larger than the sum of its proper divisors (1).

42670387 is an equidigital number, since it uses as much as digits as its factorization.

42670387 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 56448, while the sum is 37.

The square root of 42670387 is about 6532.2574199124. The cubic root of 42670387 is about 349.4423418822.

The spelling of 42670387 in words is "forty-two million, six hundred seventy thousand, three hundred eighty-seven".