61394638 has 4 divisors (see below), whose sum is σ = 92091960. Its totient is φ = 30697318.

The previous prime is 61394621. The next prime is 61394639. The reversal of 61394638 is 83649316.

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

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 61394638.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61394639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15348658 + ... + 15348661.

It is an arithmetic number, because the mean of its divisors is an integer number (23022990).

Almost surely, 2^61394638 is an apocalyptic number.

61394638 is a deficient number, since it is larger than the sum of its proper divisors (30697322).

61394638 is a wasteful number, since it uses less digits than its factorization.

61394638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30697321.

The product of its digits is 93312, while the sum is 40.

The square root of 61394638 is about 7835.4730552788. The cubic root of 61394638 is about 394.4967966015.

The spelling of 61394638 in words is "sixty-one million, three hundred ninety-four thousand, six hundred thirty-eight".