40397810 has 8 divisors (see below), whose sum is σ = 72716076. Its totient is φ = 16159120.

The previous prime is 40397809. The next prime is 40397869. The reversal of 40397810 is 1879304.

It can be written as a sum of positive squares in 2 ways, for example, as 33327529 + 7070281 = 5773^2 + 2659^2 .

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

It is a super-2 number, since 2×40397810² = 3263966105592200, which contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2019881 + ... + 2019900.

Almost surely, 2^40397810 is an apocalyptic number.

40397810 is a deficient number, since it is larger than the sum of its proper divisors (32318266).

40397810 is a wasteful number, since it uses less digits than its factorization.

40397810 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4039788.

The product of its (nonzero) digits is 6048, while the sum is 32.

The square root of 40397810 is about 6355.9271550262. The cubic root of 40397810 is about 343.1251940658.

The spelling of 40397810 in words is "forty million, three hundred ninety-seven thousand, eight hundred ten".