40431381 has 8 divisors (see below), whose sum is σ = 53955264. Its totient is φ = 26930880.

The previous prime is 40431367. The next prime is 40431383. The reversal of 40431381 is 18313404.

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

It is not a de Polignac number, because 40431381 - 2⁶ = 40431317 is a prime.

It is a super-2 number, since 2×40431381² = 3269393139134322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40431383) 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, 1305 + ... + 9086.

It is an arithmetic number, because the mean of its divisors is an integer number (6744408).

Almost surely, 2^40431381 is an apocalyptic number.

It is an amenable number.

40431381 is a deficient number, since it is larger than the sum of its proper divisors (13523883).

40431381 is a wasteful number, since it uses less digits than its factorization.

40431381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11691.

The product of its (nonzero) digits is 1152, while the sum is 24.

The square root of 40431381 is about 6358.5675273602. The cubic root of 40431381 is about 343.2202146172.

Adding to 40431381 its reverse (18313404), we get a palindrome (58744785).

The spelling of 40431381 in words is "forty million, four hundred thirty-one thousand, three hundred eighty-one".