401788388 has 48 divisors (see below), whose sum is σ = 752136000. Its totient is φ = 187463808.

The previous prime is 401788379. The next prime is 401788393. The reversal of 401788388 is 883887104.

It is a happy number.

It is a super-2 number, since 2×401788388² = 322867817463277088, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 543323 + ... + 544061.

It is an arithmetic number, because the mean of its divisors is an integer number (15669500).

Almost surely, 2^401788388 is an apocalyptic number.

It is an amenable number.

401788388 is a deficient number, since it is larger than the sum of its proper divisors (350347612).

401788388 is a wasteful number, since it uses less digits than its factorization.

401788388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 924 (or 922 counting only the distinct ones).

The product of its (nonzero) digits is 344064, while the sum is 47.

The square root of 401788388 is about 20044.6598374729. The cubic root of 401788388 is about 737.9027469078.

The spelling of 401788388 in words is "four hundred one million, seven hundred eighty-eight thousand, three hundred eighty-eight".