16403944 has 8 divisors (see below), whose sum is σ = 30757410. Its totient is φ = 8201968.

The previous prime is 16403939. The next prime is 16403953. The reversal of 16403944 is 44930461.

It can be written as a sum of positive squares in only one way, i.e., 16402500 + 1444 = 4050^2 + 38^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1025239 + ... + 1025254.

Almost surely, 2^16403944 is an apocalyptic number.

It is an amenable number.

16403944 is a deficient number, since it is larger than the sum of its proper divisors (14353466).

16403944 is a wasteful number, since it uses less digits than its factorization.

16403944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2050499 (or 2050495 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 31.

The square root of 16403944 is about 4050.1782676816. The cubic root of 16403944 is about 254.0871835792.

The spelling of 16403944 in words is "sixteen million, four hundred three thousand, nine hundred forty-four".