40637381 has 8 divisors (see below), whose sum is σ = 42547680. Its totient is φ = 38761072.

The previous prime is 40637369. The next prime is 40637393. The reversal of 40637381 is 18373604.

It is an interprime number because it is at equal distance from previous prime (40637369) and next prime (40637393).

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 40637381 - 2¹⁴ = 40620997 is a prime.

It is a super-2 number, since 2×40637381² = 3302793469078322, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40637341) 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, 6035 + ... + 10848.

It is an arithmetic number, because the mean of its divisors is an integer number (5318460).

Almost surely, 2^40637381 is an apocalyptic number.

It is an amenable number.

40637381 is a deficient number, since it is larger than the sum of its proper divisors (1910299).

40637381 is a wasteful number, since it uses less digits than its factorization.

40637381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16995.

The product of its (nonzero) digits is 12096, while the sum is 32.

The square root of 40637381 is about 6374.7455635500. The cubic root of 40637381 is about 343.8021357397.

The spelling of 40637381 in words is "forty million, six hundred thirty-seven thousand, three hundred eighty-one".