40396438 has 4 divisors (see below), whose sum is σ = 60594660. Its totient is φ = 20198218.

The previous prime is 40396429. The next prime is 40396501. The reversal of 40396438 is 83469304.

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

It is a junction number, because it is equal to n+sod(n) for n = 40396397 and 40396406.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10099108 + ... + 10099111.

It is an arithmetic number, because the mean of its divisors is an integer number (15148665).

Almost surely, 2^40396438 is an apocalyptic number.

40396438 is a deficient number, since it is larger than the sum of its proper divisors (20198222).

40396438 is a wasteful number, since it uses less digits than its factorization.

40396438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20198221.

The product of its (nonzero) digits is 62208, while the sum is 37.

The square root of 40396438 is about 6355.8192233574. The cubic root of 40396438 is about 343.1213095888.

The spelling of 40396438 in words is "forty million, three hundred ninety-six thousand, four hundred thirty-eight".