18491475 has 24 divisors (see below), whose sum is σ = 30700912. Its totient is φ = 9820800.

The previous prime is 18491467. The next prime is 18491477. The reversal of 18491475 is 57419481.

It is not a de Polignac number, because 18491475 - 2³ = 18491467 is a prime.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18491477) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 27645 + ... + 28305.

Almost surely, 2^18491475 is an apocalyptic number.

18491475 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

18491475 is a deficient number, since it is larger than the sum of its proper divisors (12209437).

18491475 is a wasteful number, since it uses less digits than its factorization.

18491475 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1047 (or 1042 counting only the distinct ones).

The product of its digits is 40320, while the sum is 39.

The square root of 18491475 is about 4300.1715082076. The cubic root of 18491475 is about 264.4379925233.

The spelling of 18491475 in words is "eighteen million, four hundred ninety-one thousand, four hundred seventy-five".