1401023440 has 40 divisors (see below), whose sum is σ = 3312600480. Its totient is φ = 550909056.

The previous prime is 1401023297. The next prime is 1401023461. The reversal of 1401023440 is 443201041.

It is a tau number, because it is divible by the number of its divisors (40).

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, 143694 + ... + 153133.

It is an arithmetic number, because the mean of its divisors is an integer number (82815012).

Almost surely, 2^1401023440 is an apocalyptic number.

1401023440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1401023440 is an abundant number, since it is smaller than the sum of its proper divisors (1911577040).

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

1401023440 is a wasteful number, since it uses less digits than its factorization.

1401023440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 296899 (or 296893 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 1401023440 is about 37430.2476614836. The cubic root of 1401023440 is about 1118.9614735425.

Adding to 1401023440 its reverse (443201041), we get a palindrome (1844224481).

The spelling of 1401023440 in words is "one billion, four hundred one million, twenty-three thousand, four hundred forty".