18458040 has 32 divisors (see below), whose sum is σ = 55374480. Its totient is φ = 4922112.

The previous prime is 18458023. The next prime is 18458057. The reversal of 18458040 is 4085481.

It is an interprime number because it is at equal distance from previous prime (18458023) and next prime (18458057).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 18457989 and 18458007.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 76789 + ... + 77028.

Almost surely, 2^18458040 is an apocalyptic number.

18458040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18458040 is an abundant number, since it is smaller than the sum of its proper divisors (36916440).

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

18458040 is a wasteful number, since it uses less digits than its factorization.

18458040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 153831 (or 153827 counting only the distinct ones).

The product of its (nonzero) digits is 5120, while the sum is 30.

The square root of 18458040 is about 4296.2821136420. The cubic root of 18458040 is about 264.2785169002.

The spelling of 18458040 in words is "eighteen million, four hundred fifty-eight thousand, forty".