18343901 has 4 divisors (see below), whose sum is σ = 19422972. Its totient is φ = 17264832.

The previous prime is 18343891. The next prime is 18343931. The reversal of 18343901 is 10934381.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 10934381 = 137 ⋅79813.

It can be written as a sum of positive squares in 2 ways, for example, as 6100900 + 12243001 = 2470^2 + 3499^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18343901 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18343931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 539510 + ... + 539543.

It is an arithmetic number, because the mean of its divisors is an integer number (4855743).

Almost surely, 2^18343901 is an apocalyptic number.

It is an amenable number.

18343901 is a deficient number, since it is larger than the sum of its proper divisors (1079071).

18343901 is a wasteful number, since it uses less digits than its factorization.

18343901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1079070.

The product of its (nonzero) digits is 2592, while the sum is 29.

The square root of 18343901 is about 4282.9780527105. The cubic root of 18343901 is about 263.7326504165.

The spelling of 18343901 in words is "eighteen million, three hundred forty-three thousand, nine hundred one".