16161870 has 64 divisors (see below), whose sum is σ = 41264640. Its totient is φ = 4042368.

The previous prime is 16161869. The next prime is 16161907. The reversal of 16161870 is 7816161.

It is a happy number.

It is a super-2 number, since 2×16161870² = 522412083793800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 40512 + ... + 40908.

It is an arithmetic number, because the mean of its divisors is an integer number (644760).

Almost surely, 2^16161870 is an apocalyptic number.

16161870 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 16161870, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20632320).

16161870 is an abundant number, since it is smaller than the sum of its proper divisors (25102770).

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

16161870 is a wasteful number, since it uses less digits than its factorization.

16161870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 489.

The product of its (nonzero) digits is 2016, while the sum is 30.

The square root of 16161870 is about 4020.1828316633. The cubic root of 16161870 is about 252.8311245760.

It can be divided in two parts, 1616 and 1870, that added together give a triangular number (3486 = T₈₃).

The spelling of 16161870 in words is "sixteen million, one hundred sixty-one thousand, eight hundred seventy".