16621902 has 32 divisors (see below), whose sum is σ = 40296960. Its totient is φ = 5036760.

The previous prime is 16621897. The next prime is 16621949. The reversal of 16621902 is 20912661.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13398 + ... + 14585.

It is an arithmetic number, because the mean of its divisors is an integer number (1259280).

Almost surely, 2^16621902 is an apocalyptic number.

16621902 is an abundant number, since it is smaller than the sum of its proper divisors (23675058).

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

16621902 is a wasteful number, since it uses less digits than its factorization.

16621902 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28005 (or 27999 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The square root of 16621902 is about 4076.9966887404. The cubic root of 16621902 is about 255.2075818379.

Adding to 16621902 its sum of digits (27), we get a square (16621929 = 4077²).

The spelling of 16621902 in words is "sixteen million, six hundred twenty-one thousand, nine hundred two".