16667742 has 80 divisors (see below), whose sum is σ = 42351120. Its totient is φ = 4346496.

The previous prime is 16667741. The next prime is 16667743. The reversal of 16667742 is 24776661.

It is an interprime number because it is at equal distance from previous prime (16667741) and next prime (16667743).

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a self number, because there is not a number n which added to its sum of digits gives 16667742.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16667741) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 187234 + ... + 187322.

It is an arithmetic number, because the mean of its divisors is an integer number (529389).

Almost surely, 2^16667742 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 16667742, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21175560).

16667742 is an abundant number, since it is smaller than the sum of its proper divisors (25683378).

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

16667742 is an equidigital number, since it uses as much as digits as its factorization.

16667742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135 (or 114 counting only the distinct ones).

The product of its digits is 84672, while the sum is 39.

The square root of 16667742 is about 4082.6146034129. The cubic root of 16667742 is about 255.4419709335.

The spelling of 16667742 in words is "sixteen million, six hundred sixty-seven thousand, seven hundred forty-two".