16506442 has 4 divisors (see below), whose sum is σ = 24759666. Its totient is φ = 8253220.

The previous prime is 16506431. The next prime is 16506463. The reversal of 16506442 is 24460561.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 15139881 + 1366561 = 3891^2 + 1169^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 16506442.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4126609 + ... + 4126612.

Almost surely, 2^16506442 is an apocalyptic number.

16506442 is a deficient number, since it is larger than the sum of its proper divisors (8253224).

16506442 is an equidigital number, since it uses as much as digits as its factorization.

16506442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8253223.

The product of its (nonzero) digits is 5760, while the sum is 28.

The square root of 16506442 is about 4062.8120803207. The cubic root of 16506442 is about 254.6152958555.

The spelling of 16506442 in words is "sixteen million, five hundred six thousand, four hundred forty-two".