61405384 has 8 divisors (see below), whose sum is σ = 115135110. Its totient is φ = 30702688.

The previous prime is 61405381. The next prime is 61405391. The reversal of 61405384 is 48350416.

It is a happy number.

61405384 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 52272900 + 9132484 = 7230^2 + 3022^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (61405381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3837829 + ... + 3837844.

Almost surely, 2^61405384 is an apocalyptic number.

It is an amenable number.

61405384 is a deficient number, since it is larger than the sum of its proper divisors (53729726).

61405384 is a wasteful number, since it uses less digits than its factorization.

61405384 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7675679 (or 7675675 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 31.

The square root of 61405384 is about 7836.1587528584. The cubic root of 61405384 is about 394.5198117235.

The spelling of 61405384 in words is "sixty-one million, four hundred five thousand, three hundred eighty-four".