84121645 has 16 divisors (see below), whose sum is σ = 107303040. Its totient is φ = 63129024.

The previous prime is 84121637. The next prime is 84121651. The reversal of 84121645 is 54612148.

84121645 = T₁₂₈₃ + T₁₂₈₄ + ... + T₁₃₇₇.

It is a cyclic number.

It is not a de Polignac number, because 84121645 - 2³ = 84121637 is a prime.

It is a super-3 number, since 3×84121645³ (a number of 25 digits) contains 333 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 in 15 ways as a sum of consecutive naturals, for example, 5487 + ... + 14083.

It is an arithmetic number, because the mean of its divisors is an integer number (6706440).

Almost surely, 2^84121645 is an apocalyptic number.

It is an amenable number.

84121645 is a deficient number, since it is larger than the sum of its proper divisors (23181395).

84121645 is a wasteful number, since it uses less digits than its factorization.

84121645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8724.

The product of its digits is 7680, while the sum is 31.

The square root of 84121645 is about 9171.7852678745. The cubic root of 84121645 is about 438.1632194039.

The spelling of 84121645 in words is "eighty-four million, one hundred twenty-one thousand, six hundred forty-five".