84400969 has 3 divisors (see below), whose sum is σ = 84410157. Its totient is φ = 84391782.

The previous prime is 84400949. The next prime is 84400973. The reversal of 84400969 is 96900448.

The square root of 84400969 is 9187.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 84400969 - 2¹⁷ = 84269897 is a prime.

It is a super-2 number, since 2×84400969² = 14247047136277922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (84400909) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 4594 + ... + 13780.

It is an arithmetic number, because the mean of its divisors is an integer number (28136719).

Almost surely, 2^84400969 is an apocalyptic number.

84400969 is the 9187-th square number.

84400969 is the 4594-th centered octagonal number.

It is an amenable number.

84400969 is a deficient number, since it is larger than the sum of its proper divisors (9188).

84400969 is an frugal number, since it uses more digits than its factorization.

84400969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18374 (or 9187 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 40.

The cubic root of 84400969 is about 438.6476539335.

The spelling of 84400969 in words is "eighty-four million, four hundred thousand, nine hundred sixty-nine".