4078642 has 4 divisors (see below), whose sum is σ = 6117966. Its totient is φ = 2039320.

The previous prime is 4078637. The next prime is 4078649. The reversal of 4078642 is 2468704.

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., 2660161 + 1418481 = 1631^2 + 1191^2 .

It is not an unprimeable number, because it can be changed into a prime (4078649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1019659 + ... + 1019662.

Almost surely, 2^4078642 is an apocalyptic number.

4078642 is a deficient number, since it is larger than the sum of its proper divisors (2039324).

4078642 is a wasteful number, since it uses less digits than its factorization.

4078642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2039323.

The product of its (nonzero) digits is 10752, while the sum is 31.

The square root of 4078642 is about 2019.5648046052. The cubic root of 4078642 is about 159.7736643521.

The spelling of 4078642 in words is "four million, seventy-eight thousand, six hundred forty-two".