4001428 has 6 divisors (see below), whose sum is σ = 7002506. Its totient is φ = 2000712.

The previous prime is 4001411. The next prime is 4001453. The reversal of 4001428 is 8241004.

4001428 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 3952144 + 49284 = 1988^2 + 222^2 .

It is a super-2 number, since 2×4001428² = 32022852078368, which contains 22 as substring.

It is a congruent number.

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, 500175 + ... + 500182.

Almost surely, 2^4001428 is an apocalyptic number.

It is an amenable number.

4001428 is a deficient number, since it is larger than the sum of its proper divisors (3001078).

4001428 is a wasteful number, since it uses less digits than its factorization.

4001428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1000361 (or 1000359 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 19.

The square root of 4001428 is about 2000.3569681434. The cubic root of 4001428 is about 158.7589930219.

The spelling of 4001428 in words is "four million, one thousand, four hundred twenty-eight".