3978154 has 4 divisors (see below), whose sum is σ = 5967234. Its totient is φ = 1989076.

The previous prime is 3978113. The next prime is 3978167. The reversal of 3978154 is 4518793.

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., 3294225 + 683929 = 1815^2 + 827^2 .

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, 994537 + ... + 994540.

Almost surely, 2^3978154 is an apocalyptic number.

3978154 is a deficient number, since it is larger than the sum of its proper divisors (1989080).

3978154 is a wasteful number, since it uses less digits than its factorization.

3978154 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1989079.

The product of its digits is 30240, while the sum is 37.

The square root of 3978154 is about 1994.5310225715. The cubic root of 3978154 is about 158.4505911335.

The spelling of 3978154 in words is "three million, nine hundred seventy-eight thousand, one hundred fifty-four".