18469940 has 24 divisors (see below), whose sum is σ = 39336192. Its totient is φ = 7283360.

The previous prime is 18469933. The next prime is 18470003. The reversal of 18469940 is 4996481.

It is a super-2 number, since 2×18469940² = 682277367207200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5084 + ... + 7923.

It is an arithmetic number, because the mean of its divisors is an integer number (1639008).

Almost surely, 2^18469940 is an apocalyptic number.

18469940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18469940 is an abundant number, since it is smaller than the sum of its proper divisors (20866252).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18469940 is a wasteful number, since it uses less digits than its factorization.

18469940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13087 (or 13085 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 41.

The square root of 18469940 is about 4297.6668088627. Note that the first 3 decimals coincide. The cubic root of 18469940 is about 264.3352986377.

The spelling of 18469940 in words is "eighteen million, four hundred sixty-nine thousand, nine hundred forty".