40898381 has 4 divisors (see below), whose sum is σ = 42308700. Its totient is φ = 39488064.

The previous prime is 40898371. The next prime is 40898383. The reversal of 40898381 is 18389804.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 29106025 + 11792356 = 5395^2 + 3434^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40898381 is a prime.

It is a super-2 number, since 2×40898381² = 3345355136842322, 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 (40898383) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 705116 + ... + 705173.

It is an arithmetic number, because the mean of its divisors is an integer number (10577175).

Almost surely, 2^40898381 is an apocalyptic number.

It is an amenable number.

40898381 is a deficient number, since it is larger than the sum of its proper divisors (1410319).

40898381 is a wasteful number, since it uses less digits than its factorization.

40898381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1410318.

The product of its (nonzero) digits is 55296, while the sum is 41.

The square root of 40898381 is about 6395.1842037583. The cubic root of 40898381 is about 344.5366067367.

It can be divided in two parts, 408 and 98381, that added together give a palindrome (98789).

The spelling of 40898381 in words is "forty million, eight hundred ninety-eight thousand, three hundred eighty-one".