16642340 has 108 divisors (see below), whose sum is σ = 43246812. Its totient is φ = 5343360.

The previous prime is 16642313. The next prime is 16642343. The reversal of 16642340 is 4324661.

16642340 = T₃₅ + T₃₆ + ... + T₄₆₃.

It can be written as a sum of positive squares in 2 ways, for example, as 4096576 + 12545764 = 2024^2 + 3542^2 .

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16642343) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 723569 + ... + 723591.

Almost surely, 2^16642340 is an apocalyptic number.

16642340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 16642340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21623406).

16642340 is an abundant number, since it is smaller than the sum of its proper divisors (26604472).

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

16642340 is a wasteful number, since it uses less digits than its factorization.

16642340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90 (or 54 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 26.

The square root of 16642340 is about 4079.5024206391. The cubic root of 16642340 is about 255.3121385890.

It can be divided in two parts, 1664 and 2340, that added together give a palindrome (4004).

The spelling of 16642340 in words is "sixteen million, six hundred forty-two thousand, three hundred forty".