16781242 has 8 divisors (see below), whose sum is σ = 25194816. Its totient is φ = 8382972.

The previous prime is 16781207. The next prime is 16781243. The reversal of 16781242 is 24218761.

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

It is a super-2 number, since 2×16781242² = 563220166125128, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (16781243) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 508 + ... + 5815.

It is an arithmetic number, because the mean of its divisors is an integer number (3149352).

Almost surely, 2^16781242 is an apocalyptic number.

16781242 is a deficient number, since it is larger than the sum of its proper divisors (8413574).

16781242 is a wasteful number, since it uses less digits than its factorization.

16781242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7652.

The product of its digits is 5376, while the sum is 31.

The square root of 16781242 is about 4096.4914255983. The cubic root of 16781242 is about 256.0204756572.

The spelling of 16781242 in words is "sixteen million, seven hundred eighty-one thousand, two hundred forty-two".