40409457 has 8 divisors (see below), whose sum is σ = 58777440. Its totient is φ = 24490560.

The previous prime is 40409443. The next prime is 40409497. The reversal of 40409457 is 75490404.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 40409457 - 2⁷ = 40409329 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33), and also a Moran number because the ratio is a prime number: 1224529 = 40409457 / (4 + 0 + 4 + 0 + 9 + 4 + 5 + 7).

It is not an unprimeable number, because it can be changed into a prime (40409497) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 612232 + ... + 612297.

It is an arithmetic number, because the mean of its divisors is an integer number (7347180).

Almost surely, 2^40409457 is an apocalyptic number.

It is an amenable number.

40409457 is a deficient number, since it is larger than the sum of its proper divisors (18367983).

40409457 is a wasteful number, since it uses less digits than its factorization.

40409457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1224543.

The product of its (nonzero) digits is 20160, while the sum is 33.

The square root of 40409457 is about 6356.8433203910. The cubic root of 40409457 is about 343.1581661101.

The spelling of 40409457 in words is "forty million, four hundred nine thousand, four hundred fifty-seven".