451978 has 4 divisors (see below), whose sum is σ = 677970. Its totient is φ = 225988.

The previous prime is 451967. The next prime is 451987. The reversal of 451978 is 879154.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 879154 = 2 ⋅439577.

It can be written as a sum of positive squares in only one way, i.e., 380689 + 71289 = 617^2 + 267^2 .

It is a super-2 number, since 2×451978² = 408568224968, 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, 112993 + ... + 112996.

2⁴⁵¹⁹⁷⁸ is an apocalyptic number.

451978 is a deficient number, since it is larger than the sum of its proper divisors (225992).

451978 is a wasteful number, since it uses less digits than its factorization.

451978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 225991.

The product of its digits is 10080, while the sum is 34.

The square root of 451978 is about 672.2930908465. The cubic root of 451978 is about 76.7430576538.

The spelling of 451978 in words is "four hundred fifty-one thousand, nine hundred seventy-eight".