16621707 has 12 divisors (see below), whose sum is σ = 22546680. Its totient is φ = 10892160.

The previous prime is 16621681. The next prime is 16621721. The reversal of 16621707 is 70712661.

It is a happy number.

It is not a de Polignac number, because 16621707 - 2⁶ = 16621643 is a prime.

It is a super-2 number, since 2×16621707² = 552562287187698, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (16621757) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10419 + ... + 11907.

It is an arithmetic number, because the mean of its divisors is an integer number (1878890).

Almost surely, 2^16621707 is an apocalyptic number.

16621707 is a deficient number, since it is larger than the sum of its proper divisors (5924973).

16621707 is an equidigital number, since it uses as much as digits as its factorization.

16621707 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1614 (or 1553 counting only the distinct ones).

The product of its (nonzero) digits is 3528, while the sum is 30.

The square root of 16621707 is about 4076.9727740077. The cubic root of 16621707 is about 255.2065838440.

The spelling of 16621707 in words is "sixteen million, six hundred twenty-one thousand, seven hundred seven".