42390613 has 2 divisors, whose sum is σ = 42390614. Its totient is φ = 42390612.

The previous prime is 42390599. The next prime is 42390629. The reversal of 42390613 is 31609324.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 41049649 + 1340964 = 6407^2 + 1158^2 .

It is a cyclic number.

It is not a de Polignac number, because 42390613 - 2⁵ = 42390581 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42393613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21195306 + 21195307.

It is an arithmetic number, because the mean of its divisors is an integer number (21195307).

Almost surely, 2^42390613 is an apocalyptic number.

It is an amenable number.

42390613 is a deficient number, since it is larger than the sum of its proper divisors (1).

42390613 is an equidigital number, since it uses as much as digits as its factorization.

42390613 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3888, while the sum is 28.

The square root of 42390613 is about 6510.8074000081. The cubic root of 42390613 is about 348.6769450828.

Adding to 42390613 its reverse (31609324), we get a palindrome (73999937).

The spelling of 42390613 in words is "forty-two million, three hundred ninety thousand, six hundred thirteen".