16507945 has 16 divisors (see below), whose sum is σ = 20271888. Its totient is φ = 12902400.

The previous prime is 16507943. The next prime is 16507961. The reversal of 16507945 is 54970561.

16507945 = T₁₂₉ + T₁₃₀ + ... + T₄₆₅.

It can be written as a sum of positive squares in 8 ways, for example, as 97344 + 16410601 = 312^2 + 4051^2 .

It is not a de Polignac number, because 16507945 - 2¹ = 16507943 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16507943) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 48817 + ... + 49153.

It is an arithmetic number, because the mean of its divisors is an integer number (1266993).

Almost surely, 2^16507945 is an apocalyptic number.

It is an amenable number.

16507945 is a deficient number, since it is larger than the sum of its proper divisors (3763943).

16507945 is a wasteful number, since it uses less digits than its factorization.

16507945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 540.

The product of its (nonzero) digits is 37800, while the sum is 37.

The square root of 16507945 is about 4062.9970465163. The cubic root of 16507945 is about 254.6230236500.

The spelling of 16507945 in words is "sixteen million, five hundred seven thousand, nine hundred forty-five".