18729950 has 24 divisors (see below), whose sum is σ = 34953120. Its totient is φ = 7467200.

The previous prime is 18729941. The next prime is 18729959. The reversal of 18729950 is 5992781.

It is an interprime number because it is at equal distance from previous prime (18729941) and next prime (18729959).

It is a super-2 number, since 2×18729950² = 701622054005000, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 18729898 and 18729907.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18729959) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 25691 + ... + 26409.

It is an arithmetic number, because the mean of its divisors is an integer number (1456380).

Almost surely, 2^18729950 is an apocalyptic number.

18729950 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18729950 is a deficient number, since it is larger than the sum of its proper divisors (16223170).

18729950 is a wasteful number, since it uses less digits than its factorization.

18729950 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1252 (or 1247 counting only the distinct ones).

The product of its (nonzero) digits is 45360, while the sum is 41.

The square root of 18729950 is about 4327.8112250883. The cubic root of 18729950 is about 265.5699138364.

The spelling of 18729950 in words is "eighteen million, seven hundred twenty-nine thousand, nine hundred fifty".