42157369 has 2 divisors, whose sum is σ = 42157370. Its totient is φ = 42157368.

The previous prime is 42157363. The next prime is 42157373. The reversal of 42157369 is 96375124.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28761769 + 13395600 = 5363^2 + 3660^2 .

It is a cyclic number.

It is not a de Polignac number, because 42157369 - 2³ = 42157361 is a prime.

It is a super-2 number, since 2×42157369² = 3554487522004322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (42157361) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21078684 + 21078685.

It is an arithmetic number, because the mean of its divisors is an integer number (21078685).

Almost surely, 2^42157369 is an apocalyptic number.

It is an amenable number.

42157369 is a deficient number, since it is larger than the sum of its proper divisors (1).

42157369 is an equidigital number, since it uses as much as digits as its factorization.

42157369 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 45360, while the sum is 37.

The square root of 42157369 is about 6492.8706286203. The cubic root of 42157369 is about 348.0362653227.

The spelling of 42157369 in words is "forty-two million, one hundred fifty-seven thousand, three hundred sixty-nine".