51245404 has 24 divisors (see below), whose sum is σ = 103792640. Its totient is φ = 21683376.

The previous prime is 51245401. The next prime is 51245423. The reversal of 51245404 is 40454215.

It is a happy number.

It is a super-2 number, since 2×51245404² = 5252182862246432, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51245401) 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, 9372 + ... + 13795.

Almost surely, 2^51245404 is an apocalyptic number.

It is an amenable number.

51245404 is an abundant number, since it is smaller than the sum of its proper divisors (52547236).

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

51245404 is a wasteful number, since it uses less digits than its factorization.

51245404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23257 (or 23255 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 25.

The square root of 51245404 is about 7158.5895258773. The cubic root of 51245404 is about 371.4368381648.

Adding to 51245404 its reverse (40454215), we get a palindrome (91699619).

The spelling of 51245404 in words is "fifty-one million, two hundred forty-five thousand, four hundred four".