651408 has 40 divisors (see below), whose sum is σ = 1729056. Its totient is φ = 211200.

The previous prime is 651401. The next prime is 651437. The reversal of 651408 is 804156.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is not an unprimeable number, because it can be changed into a prime (651401) 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, 1803 + ... + 2133.

2⁶⁵¹⁴⁰⁸ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 651408, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (864528).

651408 is an abundant number, since it is smaller than the sum of its proper divisors (1077648).

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

651408 is a wasteful number, since it uses less digits than its factorization.

651408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 383 (or 377 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 24.

The square root of 651408 is about 807.0985069990. The cubic root of 651408 is about 86.6864123319.

The spelling of 651408 in words is "six hundred fifty-one thousand, four hundred eight".