18923742 has 12 divisors (see below), whose sum is σ = 41001480. Its totient is φ = 6307908.

The previous prime is 18923651. The next prime is 18923743. The reversal of 18923742 is 24732981.

It is a super-2 number, since 2×18923742² = 716216022565128, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 18923697 and 18923706.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18923743) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 525642 + ... + 525677.

It is an arithmetic number, because the mean of its divisors is an integer number (3416790).

Almost surely, 2^18923742 is an apocalyptic number.

18923742 is an abundant number, since it is smaller than the sum of its proper divisors (22077738).

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

18923742 is a wasteful number, since it uses less digits than its factorization.

18923742 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1051327 (or 1051324 counting only the distinct ones).

The product of its digits is 24192, while the sum is 36.

The square root of 18923742 is about 4350.1427562782. The cubic root of 18923742 is about 266.4826915062.

The spelling of 18923742 in words is "eighteen million, nine hundred twenty-three thousand, seven hundred forty-two".