4139978 has 4 divisors (see below), whose sum is σ = 6209970. Its totient is φ = 2069988.

The previous prime is 4139951. The next prime is 4139983. The reversal of 4139978 is 8799314.

It is a happy number.

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., 4133089 + 6889 = 2033^2 + 83^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1034993 + ... + 1034996.

Almost surely, 2^4139978 is an apocalyptic number.

4139978 is a deficient number, since it is larger than the sum of its proper divisors (2069992).

4139978 is a wasteful number, since it uses less digits than its factorization.

4139978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2069991.

The product of its digits is 54432, while the sum is 41.

The square root of 4139978 is about 2034.6935887253. The cubic root of 4139978 is about 160.5705929376.

The spelling of 4139978 in words is "four million, one hundred thirty-nine thousand, nine hundred seventy-eight".