40401009 has 12 divisors (see below), whose sum is σ = 63662352. Its totient is φ = 24485400.

The previous prime is 40401001. The next prime is 40401013. The reversal of 40401009 is 90010404.

40401009 = T₃₆₆ + T₃₆₇ + ... + T₆₆₂.

It is not a de Polignac number, because 40401009 - 2³ = 40401001 is a prime.

It is a super-3 number, since 3×40401009³ (a number of 24 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 40400982 and 40401000.

It is not an unprimeable number, because it can be changed into a prime (40401001) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 203947 + ... + 204144.

It is an arithmetic number, because the mean of its divisors is an integer number (5305196).

Almost surely, 2^40401009 is an apocalyptic number.

It is an amenable number.

40401009 is a deficient number, since it is larger than the sum of its proper divisors (23261343).

40401009 is a wasteful number, since it uses less digits than its factorization.

40401009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 408108 (or 408105 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 40401009 is about 6356.1788049110. The cubic root of 40401009 is about 343.1342508977.

It can be divided in two parts, 4040100 and 9, that multiplied together give a square (36360900 = 6030²).

The spelling of 40401009 in words is "forty million, four hundred one thousand, nine".