1401521240 has 32 divisors (see below), whose sum is σ = 3603912480. Its totient is φ = 480521472.

The previous prime is 1401521239. The next prime is 1401521243. The reversal of 1401521240 is 421251041.

It is a happy number.

It is a super-2 number, since 2×1401521240² = 3928523572342275200, 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 (1401521243) 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, 2502437 + ... + 2502996.

It is an arithmetic number, because the mean of its divisors is an integer number (112622265).

Almost surely, 2^1401521240 is an apocalyptic number.

1401521240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1401521240 is an abundant number, since it is smaller than the sum of its proper divisors (2202391240).

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

1401521240 is a wasteful number, since it uses less digits than its factorization.

1401521240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5005451 (or 5005447 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 20.

The square root of 1401521240 is about 37436.8967731034. The cubic root of 1401521240 is about 1119.0939845452.

Adding to 1401521240 its reverse (421251041), we get a palindrome (1822772281).

The spelling of 1401521240 in words is "one billion, four hundred one million, five hundred twenty-one thousand, two hundred forty".