51405030 has 40 divisors (see below), whose sum is σ = 138224592. Its totient is φ = 13707792.

The previous prime is 51405017. The next prime is 51405049. The reversal of 51405030 is 3050415.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 51404994 and 51405012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 30922 + ... + 32541.

Almost surely, 2^51405030 is an apocalyptic number.

51405030 is an abundant number, since it is smaller than the sum of its proper divisors (86819562).

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

51405030 is a wasteful number, since it uses less digits than its factorization.

51405030 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63482 (or 63473 counting only the distinct ones).

The product of its (nonzero) digits is 300, while the sum is 18.

The square root of 51405030 is about 7169.7301204439. The cubic root of 51405030 is about 371.8221053690.

Subtracting from 51405030 its product of nonzero digits (300), we obtain a triangular number (51404730 = T₁₀₁₃₉).

Adding to 51405030 its reverse (3050415), we get a palindrome (54455445).

The spelling of 51405030 in words is "fifty-one million, four hundred five thousand, thirty".