16640402 has 8 divisors (see below), whose sum is σ = 25276800. Its totient is φ = 8214804.

The previous prime is 16640401. The next prime is 16640411. The reversal of 16640402 is 20404661.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-3 number, since 3×16640402³ (a number of 23 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (16640401) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 52502 + ... + 52817.

It is an arithmetic number, because the mean of its divisors is an integer number (3159600).

Almost surely, 2^16640402 is an apocalyptic number.

16640402 is a deficient number, since it is larger than the sum of its proper divisors (8636398).

16640402 is a wasteful number, since it uses less digits than its factorization.

16640402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105400.

The product of its (nonzero) digits is 1152, while the sum is 23.

The square root of 16640402 is about 4079.2648847556. The cubic root of 16640402 is about 255.3022278407.

The spelling of 16640402 in words is "sixteen million, six hundred forty thousand, four hundred two".