61843407 has 4 divisors (see below), whose sum is σ = 82457880. Its totient is φ = 41228936.

The previous prime is 61843403. The next prime is 61843427. The reversal of 61843407 is 70434816.

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

It is a cyclic number.

It is not a de Polignac number, because 61843407 - 2² = 61843403 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61843403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10307232 + ... + 10307237.

It is an arithmetic number, because the mean of its divisors is an integer number (20614470).

Almost surely, 2^61843407 is an apocalyptic number.

61843407 is a deficient number, since it is larger than the sum of its proper divisors (20614473).

61843407 is a wasteful number, since it uses less digits than its factorization.

61843407 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20614472.

The product of its (nonzero) digits is 16128, while the sum is 33.

The square root of 61843407 is about 7864.0579219637. The cubic root of 61843407 is about 395.4556659981.

It can be divided in two parts, 6184 and 3407, that added together give a triangular number (9591 = T₁₃₈).

The spelling of 61843407 in words is "sixty-one million, eight hundred forty-three thousand, four hundred seven".