401261240 has 32 divisors (see below), whose sum is σ = 903782880. Its totient is φ = 160336512.

The previous prime is 401261239. The next prime is 401261249. The reversal of 401261240 is 42162104.

It is a super-2 number, since 2×401261240² = 322021165452675200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (401261249) 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, 37802 + ... + 47238.

It is an arithmetic number, because the mean of its divisors is an integer number (28243215).

Almost surely, 2^401261240 is an apocalyptic number.

401261240 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

401261240 is an abundant number, since it is smaller than the sum of its proper divisors (502521640).

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

401261240 is a wasteful number, since it uses less digits than its factorization.

401261240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10511 (or 10507 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 401261240 is about 20031.5061840092. The cubic root of 401261240 is about 737.5798952035.

The spelling of 401261240 in words is "four hundred one million, two hundred sixty-one thousand, two hundred forty".