16861090 has 8 divisors (see below), whose sum is σ = 30349980. Its totient is φ = 6744432.

The previous prime is 16861087. The next prime is 16861111. The reversal of 16861090 is 9016861.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 16426809 + 434281 = 4053^2 + 659^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 843045 + ... + 843064.

Almost surely, 2^16861090 is an apocalyptic number.

16861090 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

16861090 is a deficient number, since it is larger than the sum of its proper divisors (13488890).

16861090 is a wasteful number, since it uses less digits than its factorization.

16861090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1686116.

The product of its (nonzero) digits is 2592, while the sum is 31.

The square root of 16861090 is about 4106.2257609635. The cubic root of 16861090 is about 256.4258962862.

The spelling of 16861090 in words is "sixteen million, eight hundred sixty-one thousand, ninety".