61439907 has 8 divisors (see below), whose sum is σ = 82373200. Its totient is φ = 40733280.

The previous prime is 61439899. The next prime is 61439927. The reversal of 61439907 is 70993416.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 61439907 - 2³ = 61439899 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61439927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 56032 + ... + 57117.

It is an arithmetic number, because the mean of its divisors is an integer number (10296650).

Almost surely, 2^61439907 is an apocalyptic number.

61439907 is a deficient number, since it is larger than the sum of its proper divisors (20933293).

61439907 is a wasteful number, since it uses less digits than its factorization.

61439907 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113333.

The product of its (nonzero) digits is 40824, while the sum is 39.

The square root of 61439907 is about 7838.3612445460. The cubic root of 61439907 is about 394.5937327975.

The spelling of 61439907 in words is "sixty-one million, four hundred thirty-nine thousand, nine hundred seven".