18935649 has 6 divisors (see below), whose sum is σ = 27351506. Its totient is φ = 12623760.

The previous prime is 18935641. The next prime is 18935663. The reversal of 18935649 is 94653981.

It is a happy number.

18935649 is a `hidden beast` number, since 1 + 89 + 3 + 564 + 9 = 666.

It can be written as a sum of positive squares in only one way, i.e., 16548624 + 2387025 = 4068^2 + 1545^2 .

It is not a de Polignac number, because 18935649 - 2³ = 18935641 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18935641) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1051972 + ... + 1051989.

Almost surely, 2^18935649 is an apocalyptic number.

It is an amenable number.

18935649 is a deficient number, since it is larger than the sum of its proper divisors (8415857).

18935649 is a wasteful number, since it uses less digits than its factorization.

18935649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2103967 (or 2103964 counting only the distinct ones).

The product of its digits is 233280, while the sum is 45.

The square root of 18935649 is about 4351.5111168421. The cubic root of 18935649 is about 266.5385709432.

The spelling of 18935649 in words is "eighteen million, nine hundred thirty-five thousand, six hundred forty-nine".