16422640 has 40 divisors (see below), whose sum is σ = 41122368. Its totient is φ = 6063360.

The previous prime is 16422617. The next prime is 16422641. The reversal of 16422640 is 4622461.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16422641) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6856 + ... + 8935.

Almost surely, 2^16422640 is an apocalyptic number.

16422640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16422640 is an abundant number, since it is smaller than the sum of its proper divisors (24699728).

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

16422640 is a wasteful number, since it uses less digits than its factorization.

16422640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15817 (or 15811 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 25.

The square root of 16422640 is about 4052.4856569765. The cubic root of 16422640 is about 254.1836768454.

The spelling of 16422640 in words is "sixteen million, four hundred twenty-two thousand, six hundred forty".