40406725 has 6 divisors (see below), whose sum is σ = 50104370. Its totient is φ = 32325360.

The previous prime is 40406687. The next prime is 40406747. The reversal of 40406725 is 52760404.

It can be written as a sum of positive squares in 3 ways, for example, as 185761 + 40220964 = 431^2 + 6342^2 .

It is a de Polignac number, because none of the positive numbers 2^k-40406725 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 40406693 and 40406702.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 808110 + ... + 808159.

Almost surely, 2^40406725 is an apocalyptic number.

It is an amenable number.

40406725 is a deficient number, since it is larger than the sum of its proper divisors (9697645).

40406725 is a wasteful number, since it uses less digits than its factorization.

40406725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1616279 (or 1616274 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 28.

The square root of 40406725 is about 6356.6284302293. The cubic root of 40406725 is about 343.1504325306.

The spelling of 40406725 in words is "forty million, four hundred six thousand, seven hundred twenty-five".