84420831 has 16 divisors (see below), whose sum is σ = 123886080. Its totient is φ = 50709120.

The previous prime is 84420811. The next prime is 84420841. The reversal of 84420831 is 13802448.

It is not a de Polignac number, because 84420831 - 2¹¹ = 84418783 is a prime.

It is a super-2 number, since 2×84420831² = 14253753413461122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84420811) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7591 + ... + 15048.

It is an arithmetic number, because the mean of its divisors is an integer number (7742880).

Almost surely, 2^84420831 is an apocalyptic number.

84420831 is a deficient number, since it is larger than the sum of its proper divisors (39465249).

84420831 is a wasteful number, since it uses less digits than its factorization.

84420831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22766.

The product of its (nonzero) digits is 6144, while the sum is 30.

The square root of 84420831 is about 9188.0809204099. The cubic root of 84420831 is about 438.6820600802.

The spelling of 84420831 in words is "eighty-four million, four hundred twenty thousand, eight hundred thirty-one".