16142978 has 4 divisors (see below), whose sum is σ = 24214470. Its totient is φ = 8071488.

The previous prime is 16142963. The next prime is 16142993. The reversal of 16142978 is 87924161.

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

It is an interprime number because it is at equal distance from previous prime (16142963) and next prime (16142993).

It can be written as a sum of positive squares in only one way, i.e., 16104169 + 38809 = 4013^2 + 197^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4035743 + ... + 4035746.

Almost surely, 2^16142978 is an apocalyptic number.

16142978 is a deficient number, since it is larger than the sum of its proper divisors (8071492).

16142978 is an equidigital number, since it uses as much as digits as its factorization.

16142978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8071491.

The product of its digits is 24192, while the sum is 38.

The square root of 16142978 is about 4017.8325002419. The cubic root of 16142978 is about 252.7325726978.

The spelling of 16142978 in words is "sixteen million, one hundred forty-two thousand, nine hundred seventy-eight".