42451456 has 20 divisors (see below), whose sum is σ = 84821022. Its totient is φ = 21225472.

The previous prime is 42451439. The next prime is 42451457. The reversal of 42451456 is 65415424.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 39942400 + 2509056 = 6320^2 + 1584^2 .

It is a super-2 number, since 2×42451456² = 3604252233039872, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (42451457) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40945 + ... + 41968.

Almost surely, 2^42451456 is an apocalyptic number.

It is an amenable number.

42451456 is a deficient number, since it is larger than the sum of its proper divisors (42369566).

42451456 is an frugal number, since it uses more digits than its factorization.

42451456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82931 (or 82915 counting only the distinct ones).

The product of its digits is 19200, while the sum is 31.

The square root of 42451456 is about 6515.4781865954. The cubic root of 42451456 is about 348.8436833318.

The spelling of 42451456 in words is "forty-two million, four hundred fifty-one thousand, four hundred fifty-six".