142451978 has 4 divisors (see below), whose sum is σ = 213677970. Its totient is φ = 71225988.

The previous prime is 142451951. The next prime is 142452007. The reversal of 142451978 is 879154241.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 879154241 = 7 ⋅125593463.

It can be written as a sum of positive squares in only one way, i.e., 87291649 + 55160329 = 9343^2 + 7427^2 .

It is a super-2 number, since 2×142451978² = 40585132072224968, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35612993 + ... + 35612996.

Almost surely, 2^142451978 is an apocalyptic number.

142451978 is a deficient number, since it is larger than the sum of its proper divisors (71225992).

142451978 is an equidigital number, since it uses as much as digits as its factorization.

142451978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71225991.

The product of its digits is 80640, while the sum is 41.

The square root of 142451978 is about 11935.3247965860. The cubic root of 142451978 is about 522.2632832627.

The spelling of 142451978 in words is "one hundred forty-two million, four hundred fifty-one thousand, nine hundred seventy-eight".