40694578 has 4 divisors (see below), whose sum is σ = 61041870. Its totient is φ = 20347288.

The previous prime is 40694543. The next prime is 40694581. The reversal of 40694578 is 87549604.

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., 24830289 + 15864289 = 4983^2 + 3983^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10173643 + ... + 10173646.

Almost surely, 2^40694578 is an apocalyptic number.

40694578 is a deficient number, since it is larger than the sum of its proper divisors (20347292).

40694578 is a wasteful number, since it uses less digits than its factorization.

40694578 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20347291.

The product of its (nonzero) digits is 241920, while the sum is 43.

The square root of 40694578 is about 6379.2302043428. The cubic root of 40694578 is about 343.9633603035.

The spelling of 40694578 in words is "forty million, six hundred ninety-four thousand, five hundred seventy-eight".