9977945 has 8 divisors (see below), whose sum is σ = 12603840. Its totient is φ = 7562160.

The previous prime is 9977923. The next prime is 9977951. The reversal of 9977945 is 5497799.

9977945 = T₁₀₉ + T₁₁₀ + ... + T₃₉₃.

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

It is not a de Polignac number, because 9977945 - 2⁶ = 9977881 is a prime.

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 9977893 and 9977902.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 52421 + ... + 52610.

It is an arithmetic number, because the mean of its divisors is an integer number (1575480).

Almost surely, 2^9977945 is an apocalyptic number.

9977945 is a gapful number since it is divisible by the number (95) formed by its first and last digit.

It is an amenable number.

9977945 is a deficient number, since it is larger than the sum of its proper divisors (2625895).

9977945 is a wasteful number, since it uses less digits than its factorization.

9977945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105055.

The product of its digits is 714420, while the sum is 50.

The square root of 9977945 is about 3158.7885335996. The cubic root of 9977945 is about 215.2849655626.

It can be divided in two parts, 997794 and 5, that added together give a palindrome (997799).

The spelling of 9977945 in words is "nine million, nine hundred seventy-seven thousand, nine hundred forty-five".