40019257 has 8 divisors (see below), whose sum is σ = 40708584. Its totient is φ = 39333888.

The previous prime is 40019251. The next prime is 40019261. The reversal of 40019257 is 75291004.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 881721 + 39137536 = 939^2 + 6256^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 40019257 - 2³ = 40019249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40019251) 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, 24993 + ... + 26545.

It is an arithmetic number, because the mean of its divisors is an integer number (5088573).

Almost surely, 2^40019257 is an apocalyptic number.

It is an amenable number.

40019257 is a deficient number, since it is larger than the sum of its proper divisors (689327).

40019257 is a wasteful number, since it uses less digits than its factorization.

40019257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1979.

The product of its (nonzero) digits is 2520, while the sum is 28.

The square root of 40019257 is about 6326.0775366731. The cubic root of 40019257 is about 342.0500622086.

The spelling of 40019257 in words is "forty million, nineteen thousand, two hundred fifty-seven".