91400420 has 24 divisors (see below), whose sum is σ = 192125304. Its totient is φ = 36525056.

The previous prime is 91400417. The next prime is 91400447. The reversal of 91400420 is 2400419.

It can be written as a sum of positive squares in 4 ways, for example, as 26790976 + 64609444 = 5176^2 + 8038^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 91400392 and 91400401.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32594 + ... + 35286.

It is an arithmetic number, because the mean of its divisors is an integer number (8005221).

Almost surely, 2^91400420 is an apocalyptic number.

It is an amenable number.

91400420 is an abundant number, since it is smaller than the sum of its proper divisors (100724884).

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

91400420 is a wasteful number, since it uses less digits than its factorization.

91400420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4399 (or 4397 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 91400420 is about 9560.3566879066. The cubic root of 91400420 is about 450.4529102629.

Adding to 91400420 its reverse (2400419), we get a palindrome (93800839).

The spelling of 91400420 in words is "ninety-one million, four hundred thousand, four hundred twenty".