40381000 has 64 divisors (see below), whose sum is σ = 103109760. Its totient is φ = 14680000.

The previous prime is 40380971. The next prime is 40381039. The reversal of 40381000 is 18304.

It is a super-2 number, since 2×40381000² = 3261250322000000, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9165 + ... + 12835.

It is an arithmetic number, because the mean of its divisors is an integer number (1611090).

Almost surely, 2^40381000 is an apocalyptic number.

40381000 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 40381000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (51554880).

40381000 is an abundant number, since it is smaller than the sum of its proper divisors (62728760).

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

40381000 is a wasteful number, since it uses less digits than its factorization.

40381000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3703 (or 3689 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 40381000 is about 6354.6046297154. The cubic root of 40381000 is about 343.0775946643.

Adding to 40381000 its reverse (18304), we get a palindrome (40399304).

The spelling of 40381000 in words is "forty million, three hundred eighty-one thousand".