40697842 has 4 divisors (see below), whose sum is σ = 61046766. Its totient is φ = 20348920.

The previous prime is 40697837. The next prime is 40697843. The reversal of 40697842 is 24879604.

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

It can be written as a sum of positive squares in only one way, i.e., 40056241 + 641601 = 6329^2 + 801^2 .

It is a junction number, because it is equal to n+sod(n) for n = 40697795 and 40697804.

It is not an unprimeable number, because it can be changed into a prime (40697843) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10174459 + ... + 10174462.

Almost surely, 2^40697842 is an apocalyptic number.

40697842 is a deficient number, since it is larger than the sum of its proper divisors (20348924).

40697842 is a wasteful number, since it uses less digits than its factorization.

40697842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20348923.

The product of its (nonzero) digits is 96768, while the sum is 40.

The square root of 40697842 is about 6379.4860294541. The cubic root of 40697842 is about 343.9725561755.

It can be divided in two parts, 4069 and 7842, that added together give a palindrome (11911).

The spelling of 40697842 in words is "forty million, six hundred ninety-seven thousand, eight hundred forty-two".