40690381 has 8 divisors (see below), whose sum is σ = 44694720. Its totient is φ = 36872352.

The previous prime is 40690369. The next prime is 40690387. The reversal of 40690381 is 18309604.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 40690381 - 2¹³ = 40682189 is a prime.

It is a super-2 number, since 2×40690381² = 3311414211850322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40690387) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 46120 + ... + 46993.

It is an arithmetic number, because the mean of its divisors is an integer number (5586840).

Almost surely, 2^40690381 is an apocalyptic number.

It is an amenable number.

40690381 is a deficient number, since it is larger than the sum of its proper divisors (4004339).

40690381 is a wasteful number, since it uses less digits than its factorization.

40690381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93155.

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 40690381 is about 6378.9012376741. The cubic root of 40690381 is about 343.9515351094.

Adding to 40690381 its reverse (18309604), we get a palindrome (58999985).

The spelling of 40690381 in words is "forty million, six hundred ninety thousand, three hundred eighty-one".