42547399 has 2 divisors, whose sum is σ = 42547400. Its totient is φ = 42547398.

The previous prime is 42547369. The next prime is 42547433. The reversal of 42547399 is 99374524.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 42547399 - 2²³ = 34158791 is a prime.

It is equal to p_2578876 and since 42547399 and 2578876 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42547369) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21273699 + 21273700.

It is an arithmetic number, because the mean of its divisors is an integer number (21273700).

Almost surely, 2^42547399 is an apocalyptic number.

42547399 is a deficient number, since it is larger than the sum of its proper divisors (1).

42547399 is an equidigital number, since it uses as much as digits as its factorization.

42547399 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 42547399 is about 6522.8367295219. The cubic root of 42547399 is about 349.1062885925.

The spelling of 42547399 in words is "forty-two million, five hundred forty-seven thousand, three hundred ninety-nine".