40217790 has 32 divisors (see below), whose sum is σ = 96850080. Its totient is φ = 10688384.

The previous prime is 40217783. The next prime is 40217791. The reversal of 40217790 is 9771204.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40217791) 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, 7396 + ... + 11624.

It is an arithmetic number, because the mean of its divisors is an integer number (3026565).

Almost surely, 2^40217790 is an apocalyptic number.

40217790 is an abundant number, since it is smaller than the sum of its proper divisors (56632290).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

40217790 is a wasteful number, since it uses less digits than its factorization.

40217790 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4556.

The product of its (nonzero) digits is 3528, while the sum is 30.

The square root of 40217790 is about 6341.7497585446. The cubic root of 40217790 is about 342.6147589939.

Adding to 40217790 its reverse (9771204), we get a palindrome (49988994).

It can be divided in two parts, 4021 and 7790, that added together give a palindrome (11811).

The spelling of 40217790 in words is "forty million, two hundred seventeen thousand, seven hundred ninety".