42705451 has 4 divisors (see below), whose sum is σ = 42734272. Its totient is φ = 42676632.

The previous prime is 42705431. The next prime is 42705461. The reversal of 42705451 is 15450724.

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

It is a cyclic number.

It is not a de Polignac number, because 42705451 - 2⁵ = 42705419 is a prime.

It is a super-2 number, since 2×42705451² = 3647511090226802, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42705431) 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, 12060 + ... + 15193.

It is an arithmetic number, because the mean of its divisors is an integer number (10683568).

Almost surely, 2^42705451 is an apocalyptic number.

42705451 is a deficient number, since it is larger than the sum of its proper divisors (28821).

42705451 is a wasteful number, since it uses less digits than its factorization.

42705451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28820.

The product of its (nonzero) digits is 5600, while the sum is 28.

The square root of 42705451 is about 6534.9407801448. The cubic root of 42705451 is about 349.5380326914.

The spelling of 42705451 in words is "forty-two million, seven hundred five thousand, four hundred fifty-one".