51478389 has 8 divisors (see below), whose sum is σ = 76264320. Its totient is φ = 34318908.

The previous prime is 51478381. The next prime is 51478409. The reversal of 51478389 is 98387415.

It is not a de Polignac number, because 51478389 - 2³ = 51478381 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51478381) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 953277 + ... + 953330.

It is an arithmetic number, because the mean of its divisors is an integer number (9533040).

Almost surely, 2^51478389 is an apocalyptic number.

It is an amenable number.

51478389 is a deficient number, since it is larger than the sum of its proper divisors (24785931).

51478389 is a wasteful number, since it uses less digits than its factorization.

51478389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1906616 (or 1906610 counting only the distinct ones).

The product of its digits is 241920, while the sum is 45.

The square root of 51478389 is about 7174.8441794927. The cubic root of 51478389 is about 371.9988943776.

The spelling of 51478389 in words is "fifty-one million, four hundred seventy-eight thousand, three hundred eighty-nine".