16140420 has 36 divisors (see below), whose sum is σ = 48959820. Its totient is φ = 4304064.

The previous prime is 16140419. The next prime is 16140451. The reversal of 16140420 is 2404161.

It can be written as a sum of positive squares in 2 ways, for example, as 5171076 + 10969344 = 2274^2 + 3312^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 16140393 and 16140402.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 44655 + ... + 45014.

It is an arithmetic number, because the mean of its divisors is an integer number (1359995).

Almost surely, 2^16140420 is an apocalyptic number.

16140420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16140420 is an abundant number, since it is smaller than the sum of its proper divisors (32819400).

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

16140420 is a wasteful number, since it uses less digits than its factorization.

16140420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89684 (or 89679 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 16140420 is about 4017.5141567890. The cubic root of 16140420 is about 252.7192227432.

Adding to 16140420 its reverse (2404161), we get a palindrome (18544581).

The spelling of 16140420 in words is "sixteen million, one hundred forty thousand, four hundred twenty".