40400121 has 16 divisors (see below), whose sum is σ = 56540160. Its totient is φ = 25610640.

The previous prime is 40400093. The next prime is 40400123. The reversal of 40400121 is 12100404.

It is not a de Polignac number, because 40400121 - 2⁵ = 40400089 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 40400097 and 40400106.

It is not an unprimeable number, because it can be changed into a prime (40400123) 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, 10716 + ... + 13986.

It is an arithmetic number, because the mean of its divisors is an integer number (3533760).

Almost surely, 2^40400121 is an apocalyptic number.

It is an amenable number.

40400121 is a deficient number, since it is larger than the sum of its proper divisors (16140039).

40400121 is a wasteful number, since it uses less digits than its factorization.

40400121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3476.

The product of its (nonzero) digits is 32, while the sum is 12.

The square root of 40400121 is about 6356.1089512374. The cubic root of 40400121 is about 343.1317368892.

Adding to 40400121 its reverse (12100404), we get a palindrome (52500525).

The spelling of 40400121 in words is "forty million, four hundred thousand, one hundred twenty-one".