978705749 has 8 divisors (see below), whose sum is σ = 1121119488. Its totient is φ = 836941680.

The previous prime is 978705737. The next prime is 978705787. The reversal of 978705749 is 947507879.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-978705749 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 978705694 and 978705703.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (978705449) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 159182 + ... + 165215.

It is an arithmetic number, because the mean of its divisors is an integer number (140139936).

Almost surely, 2^978705749 is an apocalyptic number.

It is an amenable number.

978705749 is a deficient number, since it is larger than the sum of its proper divisors (142413739).

978705749 is a wasteful number, since it uses less digits than its factorization.

978705749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 324835.

The product of its (nonzero) digits is 4445280, while the sum is 56.

The square root of 978705749 is about 31284.2731895756. The cubic root of 978705749 is about 992.8509289104.

The spelling of 978705749 in words is "nine hundred seventy-eight million, seven hundred five thousand, seven hundred forty-nine".