18838402 has 16 divisors (see below), whose sum is σ = 31660992. Its totient is φ = 8331120.

The previous prime is 18838387. The next prime is 18838409. The reversal of 18838402 is 20483881.

It is not an unprimeable number, because it can be changed into a prime (18838409) 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 7 ways as a sum of consecutive naturals, for example, 10758 + ... + 12385.

It is an arithmetic number, because the mean of its divisors is an integer number (1978812).

Almost surely, 2^18838402 is an apocalyptic number.

18838402 is a deficient number, since it is larger than the sum of its proper divisors (12822590).

18838402 is a wasteful number, since it uses less digits than its factorization.

18838402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23193.

The product of its (nonzero) digits is 12288, while the sum is 34.

The square root of 18838402 is about 4340.3227990554. The cubic root of 18838402 is about 266.0815040346.

The spelling of 18838402 in words is "eighteen million, eight hundred thirty-eight thousand, four hundred two".