40403240 has 16 divisors (see below), whose sum is σ = 90907380. Its totient is φ = 16161280.

The previous prime is 40403201. The next prime is 40403243. The reversal of 40403240 is 4230404.

It can be written as a sum of positive squares in 2 ways, for example, as 35832196 + 4571044 = 5986^2 + 2138^2 .

It is not an unprimeable number, because it can be changed into a prime (40403243) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 505001 + ... + 505080.

Almost surely, 2^40403240 is an apocalyptic number.

40403240 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

40403240 is an abundant number, since it is smaller than the sum of its proper divisors (50504140).

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

40403240 is a wasteful number, since it uses less digits than its factorization.

40403240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1010092 (or 1010088 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 17.

The square root of 40403240 is about 6356.3543010125. The cubic root of 40403240 is about 343.1405668986.

Adding to 40403240 its reverse (4230404), we get a palindrome (44633644).

The spelling of 40403240 in words is "forty million, four hundred three thousand, two hundred forty".