401388378 has 16 divisors (see below), whose sum is σ = 805395360. Its totient is φ = 133359696.

The previous prime is 401388371. The next prime is 401388389. The reversal of 401388378 is 873883104.

It is a super-2 number, since 2×401388378² = 322225259986941768, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (401388371) 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, 107113 + ... + 110796.

It is an arithmetic number, because the mean of its divisors is an integer number (50337210).

Almost surely, 2^401388378 is an apocalyptic number.

401388378 is an abundant number, since it is smaller than the sum of its proper divisors (404006982).

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

401388378 is a wasteful number, since it uses less digits than its factorization.

401388378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 218221.

The product of its (nonzero) digits is 129024, while the sum is 42.

The square root of 401388378 is about 20034.6793835090. The cubic root of 401388378 is about 737.6577867125.

It can be divided in two parts, 40138 and 8378, that added together give a triangular number (48516 = T₃₁₁).

The spelling of 401388378 in words is "four hundred one million, three hundred eighty-eight thousand, three hundred seventy-eight".