40133391 has 8 divisors (see below), whose sum is σ = 53550720. Its totient is φ = 26735832.

The previous prime is 40133381. The next prime is 40133399. The reversal of 40133391 is 19333104.

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

It is not a de Polignac number, because 40133391 - 2¹³ = 40125199 is a prime.

It is a super-2 number, since 2×40133391² = 3221378146317762, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40133399) 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, 726 + ... + 8988.

It is an arithmetic number, because the mean of its divisors is an integer number (6693840).

Almost surely, 2^40133391 is an apocalyptic number.

40133391 is a deficient number, since it is larger than the sum of its proper divisors (13417329).

40133391 is a wasteful number, since it uses less digits than its factorization.

40133391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9885.

The product of its (nonzero) digits is 972, while the sum is 24.

The square root of 40133391 is about 6335.0920277451. The cubic root of 40133391 is about 342.3749265374.

Adding to 40133391 its reverse (19333104), we get a palindrome (59466495).

The spelling of 40133391 in words is "forty million, one hundred thirty-three thousand, three hundred ninety-one".