40251405 has 16 divisors (see below), whose sum is σ = 67792320. Its totient is φ = 20337408.

The previous prime is 40251401. The next prime is 40251437. The reversal of 40251405 is 50415204.

It is not a de Polignac number, because 40251405 - 2² = 40251401 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40251401) 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, 70332 + ... + 70901.

It is an arithmetic number, because the mean of its divisors is an integer number (4237020).

Almost surely, 2^40251405 is an apocalyptic number.

It is an amenable number.

40251405 is a deficient number, since it is larger than the sum of its proper divisors (27540915).

40251405 is a wasteful number, since it uses less digits than its factorization.

40251405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141260.

The product of its (nonzero) digits is 800, while the sum is 21.

The square root of 40251405 is about 6344.3994987705. The cubic root of 40251405 is about 342.7101876412.

Adding to 40251405 its reverse (50415204), we get a palindrome (90666609).

The spelling of 40251405 in words is "forty million, two hundred fifty-one thousand, four hundred five".