18491967 has 24 divisors (see below), whose sum is σ = 29248128. Its totient is φ = 11188800.

The previous prime is 18491951. The next prime is 18491969. The reversal of 18491967 is 76919481.

It is a happy number.

It is not a de Polignac number, because 18491967 - 2⁴ = 18491951 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18491969) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5842 + ... + 8432.

It is an arithmetic number, because the mean of its divisors is an integer number (1218672).

Almost surely, 2^18491967 is an apocalyptic number.

18491967 is a deficient number, since it is larger than the sum of its proper divisors (10756161).

18491967 is a wasteful number, since it uses less digits than its factorization.

18491967 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2671 (or 2668 counting only the distinct ones).

The product of its digits is 108864, while the sum is 45.

The square root of 18491967 is about 4300.2287148476. The cubic root of 18491967 is about 264.4403377903.

The spelling of 18491967 in words is "eighteen million, four hundred ninety-one thousand, nine hundred sixty-seven".