40551381 has 24 divisors (see below), whose sum is σ = 65060160. Its totient is φ = 24951888.

The previous prime is 40551361. The next prime is 40551431. The reversal of 40551381 is 18315504.

It is not a de Polignac number, because 40551381 - 2¹⁴ = 40534997 is a prime.

It is a super-2 number, since 2×40551381² = 3288829002014322, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40551311) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 120 + ... + 9006.

It is an arithmetic number, because the mean of its divisors is an integer number (2710840).

Almost surely, 2^40551381 is an apocalyptic number.

It is an amenable number.

40551381 is a deficient number, since it is larger than the sum of its proper divisors (24508779).

40551381 is a wasteful number, since it uses less digits than its factorization.

40551381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8922 (or 8903 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 27.

The square root of 40551381 is about 6367.9966237428. The cubic root of 40551381 is about 343.5594374750.

Adding to 40551381 its reverse (18315504), we get a palindrome (58866885).

It can be divided in two parts, 4055 and 1381, that multiplied together give a palindrome (5599955).

The spelling of 40551381 in words is "forty million, five hundred fifty-one thousand, three hundred eighty-one".