42945739 has 2 divisors, whose sum is σ = 42945740. Its totient is φ = 42945738.

The previous prime is 42945731. The next prime is 42945751. The reversal of 42945739 is 93754924.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 42945739 - 2³ = 42945731 is a prime.

It is a super-2 number, since 2×42945739² = 3688672996512242, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 42945695 and 42945704.

It is not a weakly prime, because it can be changed into another prime (42945731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21472869 + 21472870.

It is an arithmetic number, because the mean of its divisors is an integer number (21472870).

Almost surely, 2^42945739 is an apocalyptic number.

42945739 is a deficient number, since it is larger than the sum of its proper divisors (1).

42945739 is an equidigital number, since it uses as much as digits as its factorization.

42945739 is an evil number, because the sum of its binary digits is even.

The product of its digits is 272160, while the sum is 43.

The square root of 42945739 is about 6553.2998557978. The cubic root of 42945739 is about 350.1923813110.

The spelling of 42945739 in words is "forty-two million, nine hundred forty-five thousand, seven hundred thirty-nine".