651438 has 12 divisors (see below), whose sum is σ = 1411488. Its totient is φ = 217140.

The previous prime is 651437. The next prime is 651439. The reversal of 651438 is 834156.

651438 is a `hidden beast` number, since 651 + 4 + 3 + 8 = 666.

It is an interprime number because it is at equal distance from previous prime (651437) and next prime (651439).

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (651437) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 18078 + ... + 18113.

It is an arithmetic number, because the mean of its divisors is an integer number (117624).

2⁶⁵¹⁴³⁸ is an apocalyptic number.

651438 is an abundant number, since it is smaller than the sum of its proper divisors (760050).

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

651438 is a wasteful number, since it uses less digits than its factorization.

651438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36199 (or 36196 counting only the distinct ones).

The product of its digits is 2880, while the sum is 27.

The square root of 651438 is about 807.1170918770. The cubic root of 651438 is about 86.6877430660.

It can be divided in two parts, 651 and 438, that added together give a square (1089 = 33²).

The spelling of 651438 in words is "six hundred fifty-one thousand, four hundred thirty-eight".