16421790 has 64 divisors (see below), whose sum is σ = 49144320. Its totient is φ = 3411840.

The previous prime is 16421777. The next prime is 16421807. The reversal of 16421790 is 9712461.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1245 + ... + 5864.

It is an arithmetic number, because the mean of its divisors is an integer number (767880).

Almost surely, 2^16421790 is an apocalyptic number.

16421790 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

16421790 is an abundant number, since it is smaller than the sum of its proper divisors (32722530).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

16421790 is a wasteful number, since it uses less digits than its factorization.

16421790 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7137.

The product of its (nonzero) digits is 3024, while the sum is 30.

The square root of 16421790 is about 4052.3807817134. The cubic root of 16421790 is about 254.1792914390.

The spelling of 16421790 in words is "sixteen million, four hundred twenty-one thousand, seven hundred ninety".