84421390 has 16 divisors (see below), whose sum is σ = 152083008. Its totient is φ = 33740896.

The previous prime is 84421387. The next prime is 84421411. The reversal of 84421390 is 9312448.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13164 + ... + 18496.

It is an arithmetic number, because the mean of its divisors is an integer number (9505188).

Almost surely, 2^84421390 is an apocalyptic number.

84421390 is a deficient number, since it is larger than the sum of its proper divisors (67661618).

84421390 is a wasteful number, since it uses less digits than its factorization.

84421390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6923.

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 84421390 is about 9188.1113402048. Note that the first 3 decimals coincide. The cubic root of 84421390 is about 438.6830283354.

The spelling of 84421390 in words is "eighty-four million, four hundred twenty-one thousand, three hundred ninety".