401423040 has 280 divisors, whose sum is σ = 1513588032. Its totient is φ = 100638720.

The previous prime is 401423021. The next prime is 401423041. The reversal of 401423040 is 40324104.

It is a super-2 number, since 2×401423040² = 322280914085683200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (401423041) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 440185 + ... + 441095.

Almost surely, 2^401423040 is an apocalyptic number.

401423040 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 401423040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (756794016).

401423040 is an abundant number, since it is smaller than the sum of its proper divisors (1112164992).

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

401423040 is a wasteful number, since it uses less digits than its factorization.

401423040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 957 (or 938 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

The square root of 401423040 is about 20035.5444148643. The cubic root of 401423040 is about 737.6790196460.

Adding to 401423040 its reverse (40324104), we get a palindrome (441747144).

The spelling of 401423040 in words is "four hundred one million, four hundred twenty-three thousand, forty".