9978437 has 4 divisors (see below), whose sum is σ = 11403936. Its totient is φ = 8552940.

The previous prime is 9978431. The next prime is 9978461. The reversal of 9978437 is 7348799.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 9978437 - 2¹⁴ = 9962053 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 9978391 and 9978400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9978431) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 712739 + ... + 712752.

It is an arithmetic number, because the mean of its divisors is an integer number (2850984).

Almost surely, 2^9978437 is an apocalyptic number.

It is an amenable number.

9978437 is a deficient number, since it is larger than the sum of its proper divisors (1425499).

9978437 is a wasteful number, since it uses less digits than its factorization.

9978437 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1425498.

The product of its digits is 381024, while the sum is 47.

The square root of 9978437 is about 3158.8664105973. The cubic root of 9978437 is about 215.2885039820.

The spelling of 9978437 in words is "nine million, nine hundred seventy-eight thousand, four hundred thirty-seven".