42451306 has 4 divisors (see below), whose sum is σ = 63676962. Its totient is φ = 21225652.

The previous prime is 42451291. The next prime is 42451319. The reversal of 42451306 is 60315424.

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

It can be written as a sum of positive squares in only one way, i.e., 34916281 + 7535025 = 5909^2 + 2745^2 .

It is a super-2 number, since 2×42451306² = 3604226762211272, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10612825 + ... + 10612828.

Almost surely, 2^42451306 is an apocalyptic number.

42451306 is a deficient number, since it is larger than the sum of its proper divisors (21225656).

42451306 is a wasteful number, since it uses less digits than its factorization.

42451306 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21225655.

The product of its (nonzero) digits is 2880, while the sum is 25.

The square root of 42451306 is about 6515.4666755345. The cubic root of 42451306 is about 348.8432724576.

The spelling of 42451306 in words is "forty-two million, four hundred fifty-one thousand, three hundred six".