51396906 has 64 divisors (see below), whose sum is σ = 116328960. Its totient is φ = 15005760.

The previous prime is 51396901. The next prime is 51396907. The reversal of 51396906 is 60969315.

It is not an unprimeable number, because it can be changed into a prime (51396901) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 260800 + ... + 260996.

It is an arithmetic number, because the mean of its divisors is an integer number (1817640).

Almost surely, 2^51396906 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51396906, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (58164480).

51396906 is an abundant number, since it is smaller than the sum of its proper divisors (64932054).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51396906 is a wasteful number, since it uses less digits than its factorization.

51396906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 339.

The product of its (nonzero) digits is 43740, while the sum is 39.

The square root of 51396906 is about 7169.1635495363. The cubic root of 51396906 is about 371.8025168713.

The spelling of 51396906 in words is "fifty-one million, three hundred ninety-six thousand, nine hundred six".