16503945 has 16 divisors (see below), whose sum is σ = 26472960. Its totient is φ = 8779904.

The previous prime is 16503941. The next prime is 16503947. The reversal of 16503945 is 54930561.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 16503945 - 2² = 16503941 is a prime.

It is not an unprimeable number, because it can be changed into a prime (16503941) 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, 6037 + ... + 8333.

It is an arithmetic number, because the mean of its divisors is an integer number (1654560).

Almost surely, 2^16503945 is an apocalyptic number.

16503945 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

16503945 is a deficient number, since it is larger than the sum of its proper divisors (9969015).

16503945 is a wasteful number, since it uses less digits than its factorization.

16503945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2784.

The product of its (nonzero) digits is 16200, while the sum is 33.

The square root of 16503945 is about 4062.5047692280. The cubic root of 16503945 is about 254.6024562936.

The spelling of 16503945 in words is "sixteen million, five hundred three thousand, nine hundred forty-five".