40123280 has 40 divisors (see below), whose sum is σ = 93690432. Its totient is φ = 15979904.

The previous prime is 40123261. The next prime is 40123301. The reversal of 40123280 is 8232104.

It is a tau number, because it is divible by the number of its divisors (40).

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20087 + ... + 21993.

Almost surely, 2^40123280 is an apocalyptic number.

40123280 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

40123280 is an abundant number, since it is smaller than the sum of its proper divisors (53567152).

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

40123280 is a wasteful number, since it uses less digits than its factorization.

40123280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2183 (or 2177 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 40123280 is about 6334.2939622345. The cubic root of 40123280 is about 342.3461720635.

Adding to 40123280 its reverse (8232104), we get a palindrome (48355384).

The spelling of 40123280 in words is "forty million, one hundred twenty-three thousand, two hundred eighty".