938778421 has 4 divisors (see below), whose sum is σ = 1072889632. Its totient is φ = 804667212.

The previous prime is 938778413. The next prime is 938778427. The reversal of 938778421 is 124877839.

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 938778421 - 2³ = 938778413 is a prime.

It is a super-3 number, since 3×938778421³ (a number of 28 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (938778427) 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, 67055595 + ... + 67055608.

It is an arithmetic number, because the mean of its divisors is an integer number (268222408).

Almost surely, 2^938778421 is an apocalyptic number.

It is an amenable number.

938778421 is a deficient number, since it is larger than the sum of its proper divisors (134111211).

938778421 is a wasteful number, since it uses less digits than its factorization.

938778421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134111210.

The product of its digits is 677376, while the sum is 49.

The square root of 938778421 is about 30639.4912000836. The cubic root of 938778421 is about 979.1615836944.

The spelling of 938778421 in words is "nine hundred thirty-eight million, seven hundred seventy-eight thousand, four hundred twenty-one".