9920402 has 4 divisors (see below), whose sum is σ = 14880606. Its totient is φ = 4960200.

The previous prime is 9920399. The next prime is 9920411. The reversal of 9920402 is 2040299.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 2040299 = 1087 ⋅1877.

It can be written as a sum of positive squares in only one way, i.e., 9853321 + 67081 = 3139^2 + 259^2 .

It is an Ulam number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2480099 + ... + 2480102.

Almost surely, 2^9920402 is an apocalyptic number.

9920402 is a deficient number, since it is larger than the sum of its proper divisors (4960204).

9920402 is a wasteful number, since it uses less digits than its factorization.

9920402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4960203.

The product of its (nonzero) digits is 1296, while the sum is 26.

The square root of 9920402 is about 3149.6669665220. Note that the first 3 decimals coincide. The cubic root of 9920402 is about 214.8703166015.

The spelling of 9920402 in words is "nine million, nine hundred twenty thousand, four hundred two".