42997457 has 4 divisors (see below), whose sum is σ = 43144500. Its totient is φ = 42850416.

The previous prime is 42997447. The next prime is 42997519. The reversal of 42997457 is 75479924.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 24196561 + 18800896 = 4919^2 + 4336^2 .

It is a cyclic number.

It is not a de Polignac number, because 42997457 - 2⁶ = 42997393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42997447) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 73082 + ... + 73667.

It is an arithmetic number, because the mean of its divisors is an integer number (10786125).

Almost surely, 2^42997457 is an apocalyptic number.

It is an amenable number.

42997457 is a deficient number, since it is larger than the sum of its proper divisors (147043).

42997457 is a wasteful number, since it uses less digits than its factorization.

42997457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147042.

The product of its digits is 635040, while the sum is 47.

The square root of 42997457 is about 6557.2446195029. The cubic root of 42997457 is about 350.3328995915.

The spelling of 42997457 in words is "forty-two million, nine hundred ninety-seven thousand, four hundred fifty-seven".