42699257 has 4 divisors (see below), whose sum is σ = 45210996. Its totient is φ = 40187520.

The previous prime is 42699229. The next prime is 42699259. The reversal of 42699257 is 75299624.

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 16679056 + 26020201 = 4084^2 + 5101^2 .

It is a cyclic number.

It is not a de Polignac number, because 42699257 - 2¹² = 42695161 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42699259) 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, 1255844 + ... + 1255877.

It is an arithmetic number, because the mean of its divisors is an integer number (11302749).

Almost surely, 2^42699257 is an apocalyptic number.

It is an amenable number.

42699257 is a deficient number, since it is larger than the sum of its proper divisors (2511739).

42699257 is a wasteful number, since it uses less digits than its factorization.

42699257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2511738.

The product of its digits is 272160, while the sum is 44.

The square root of 42699257 is about 6534.4668489480. The cubic root of 42699257 is about 349.5211328718.

The spelling of 42699257 in words is "forty-two million, six hundred ninety-nine thousand, two hundred fifty-seven".