6401388 has 24 divisors (see below), whose sum is σ = 17070592. Its totient is φ = 1828944.

The previous prime is 6401387. The next prime is 6401389. The reversal of 6401388 is 8831046.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (6401387) and next prime (6401389).

It is not an unprimeable number, because it can be changed into a prime (6401387) 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, 38020 + ... + 38187.

Almost surely, 2^6401388 is an apocalyptic number.

It is an amenable number.

6401388 is an abundant number, since it is smaller than the sum of its proper divisors (10669204).

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

6401388 is a wasteful number, since it uses less digits than its factorization.

6401388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76221 (or 76219 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 30.

The square root of 6401388 is about 2530.0964408496. The cubic root of 6401388 is about 185.6769743020.

It can be divided in two parts, 640138 and 8, that added together give a triangular number (640146 = T₁₁₃₁).

The spelling of 6401388 in words is "six million, four hundred one thousand, three hundred eighty-eight".