18974736 has 125 divisors (see below), whose sum is σ = 60409855. Its totient is φ = 5749920.
The previous prime is 18974731. The next prime is 18974741. The reversal of 18974736 is 63747981.
The square root of 18974736 is 4356.
It is a perfect power (a square, a biquadrate), and thus also a powerful number.
It is an interprime number because it is at equal distance from previous prime (18974731) and next prime (18974741).
Its product of digits (254016) is a multiple of the sum of its prime divisors (16).
It is a junction number, because it is equal to n+sod(n) for n = 18974691 and 18974700.
It is not an unprimeable number, because it can be changed into a prime (18974731) by changing a digit.
It is a polite number, since it can be written in 24 ways as a sum of consecutive naturals, for example, 1724971 + ... + 1724981.
Almost surely, 218974736 is an apocalyptic number.
18974736 is a gapful number since it is divisible by the number (16) formed by its first and last digit.
18974736 is the 4356-th square number.
It is an amenable number.
It is a practical number, because each smaller number is the sum of distinct divisors of 18974736
18974736 is an abundant number, since it is smaller than the sum of its proper divisors (41435119).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
18974736 is an frugal number, since it uses more digits than its factorization.
18974736 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 64 (or 16 counting only the distinct ones).
The product of its digits is 254016, while the sum is 45.
The cubic root of 18974736 is about 266.7218413611.
Multiplying 18974736 by its product of digits (254016), we get a square (4819886539776 = 21954242).
The spelling of 18974736 in words is "eighteen million, nine hundred seventy-four thousand, seven hundred thirty-six".
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