40257493 has 4 divisors (see below), whose sum is σ = 40613868. Its totient is φ = 39901120.

The previous prime is 40257487. The next prime is 40257509. The reversal of 40257493 is 39475204.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2582449 + 37675044 = 1607^2 + 6138^2 .

It is a cyclic number.

It is not a de Polignac number, because 40257493 - 2⁹ = 40256981 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40257403) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 178018 + ... + 178243.

It is an arithmetic number, because the mean of its divisors is an integer number (10153467).

Almost surely, 2^40257493 is an apocalyptic number.

It is an amenable number.

40257493 is a deficient number, since it is larger than the sum of its proper divisors (356375).

40257493 is a wasteful number, since it uses less digits than its factorization.

40257493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 356374.

The product of its (nonzero) digits is 30240, while the sum is 34.

The square root of 40257493 is about 6344.8792738712. The cubic root of 40257493 is about 342.7274650045.

The spelling of 40257493 in words is "forty million, two hundred fifty-seven thousand, four hundred ninety-three".