18406453 has 4 divisors (see below), whose sum is σ = 19822348. Its totient is φ = 16990560.

The previous prime is 18406379. The next prime is 18406471. The reversal of 18406453 is 35460481.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 35460481 = 7 ⋅5065783.

It can be written as a sum of positive squares in 2 ways, for example, as 7496644 + 10909809 = 2738^2 + 3303^2 .

It is a cyclic number.

It is not a de Polignac number, because 18406453 - 2⁹ = 18405941 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18406483) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 707928 + ... + 707953.

It is an arithmetic number, because the mean of its divisors is an integer number (4955587).

Almost surely, 2^18406453 is an apocalyptic number.

18406453 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

18406453 is a deficient number, since it is larger than the sum of its proper divisors (1415895).

18406453 is a wasteful number, since it uses less digits than its factorization.

18406453 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1415894.

The product of its (nonzero) digits is 11520, while the sum is 31.

The square root of 18406453 is about 4290.2742336592. The cubic root of 18406453 is about 264.0320830691.

The spelling of 18406453 in words is "eighteen million, four hundred six thousand, four hundred fifty-three".