1401240440 has 32 divisors (see below), whose sum is σ = 3154032000. Its totient is φ = 560275584.

The previous prime is 1401240439. The next prime is 1401240493. The reversal of 1401240440 is 440421041.

It is a happy number.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 129146 + ... + 139574.

It is an arithmetic number, because the mean of its divisors is an integer number (98563500).

Almost surely, 2^1401240440 is an apocalyptic number.

1401240440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1401240440 is an abundant number, since it is smaller than the sum of its proper divisors (1752791560).

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

1401240440 is a wasteful number, since it uses less digits than its factorization.

1401240440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13799 (or 13795 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 20.

The square root of 1401240440 is about 37433.1462743916. The cubic root of 1401240440 is about 1119.0192413375.

Adding to 1401240440 its reverse (440421041), we get a palindrome (1841661481).

The spelling of 1401240440 in words is "one billion, four hundred one million, two hundred forty thousand, four hundred forty".