9940978 has 4 divisors (see below), whose sum is σ = 14911470. Its totient is φ = 4970488.

The previous prime is 9940963. The next prime is 9941003. The reversal of 9940978 is 8790499.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8790499 = 139 ⋅63241.

It can be written as a sum of positive squares in only one way, i.e., 7006609 + 2934369 = 2647^2 + 1713^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2485243 + ... + 2485246.

Almost surely, 2^9940978 is an apocalyptic number.

9940978 is a deficient number, since it is larger than the sum of its proper divisors (4970492).

9940978 is a wasteful number, since it uses less digits than its factorization.

9940978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4970491.

The product of its (nonzero) digits is 163296, while the sum is 46.

The square root of 9940978 is about 3152.9316516537. The cubic root of 9940978 is about 215.0187688681.

The spelling of 9940978 in words is "nine million, nine hundred forty thousand, nine hundred seventy-eight".