1866906428 has 24 divisors (see below), whose sum is σ = 3376082304. Its totient is φ = 902376000.

The previous prime is 1866906421. The next prime is 1866906439. The reversal of 1866906428 is 8246096681.

It is a happy number.

It is a super-2 number, since 2×1866906428² = 6970679221815438368, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1866906421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 116078 + ... + 131178.

It is an arithmetic number, because the mean of its divisors is an integer number (140670096).

Almost surely, 2^1866906428 is an apocalyptic number.

It is an amenable number.

1866906428 is a deficient number, since it is larger than the sum of its proper divisors (1509175876).

1866906428 is a wasteful number, since it uses less digits than its factorization.

1866906428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16133 (or 16131 counting only the distinct ones).

The product of its (nonzero) digits is 995328, while the sum is 50.

The square root of 1866906428 is about 43207.7125985628. The cubic root of 1866906428 is about 1231.3292145587.

The spelling of 1866906428 in words is "one billion, eight hundred sixty-six million, nine hundred six thousand, four hundred twenty-eight".