40250091 has 16 divisors (see below), whose sum is σ = 61779200. Its totient is φ = 22832928.

The previous prime is 40250087. The next prime is 40250123. The reversal of 40250091 is 19005204.

It is not a de Polignac number, because 40250091 - 2² = 40250087 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (40250011) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3976 + ... + 9813.

It is an arithmetic number, because the mean of its divisors is an integer number (3861200).

Almost surely, 2^40250091 is an apocalyptic number.

40250091 is a deficient number, since it is larger than the sum of its proper divisors (21529109).

40250091 is a wasteful number, since it uses less digits than its factorization.

40250091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13938.

The product of its (nonzero) digits is 360, while the sum is 21.

The square root of 40250091 is about 6344.2959420254. The cubic root of 40250091 is about 342.7064583628.

Adding to 40250091 its reverse (19005204), we get a palindrome (59255295).

The spelling of 40250091 in words is "forty million, two hundred fifty thousand, ninety-one".