1401236640 has 72 divisors (see below), whose sum is σ = 4781724948. Its totient is φ = 373662720.

The previous prime is 1401236597. The next prime is 1401236671. The reversal of 1401236640 is 466321041.

1401236640 is a `hidden beast` number, since 1 + 4 + 0 + 12 + 3 + 6 + 640 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1269354384 + 131882256 = 35628^2 + 11484^2 .

It is a tau number, because it is divible by the number of its divisors (72).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 485101 + ... + 487980.

Almost surely, 2^1401236640 is an apocalyptic number.

1401236640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1401236640 is an abundant number, since it is smaller than the sum of its proper divisors (3380488308).

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

1401236640 is a wasteful number, since it uses less digits than its factorization.

1401236640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 973102 (or 973091 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 1401236640 is about 37433.0955172024. The cubic root of 1401236640 is about 1119.0182297868.

Adding to 1401236640 its reverse (466321041), we get a palindrome (1867557681).

The spelling of 1401236640 in words is "one billion, four hundred one million, two hundred thirty-six thousand, six hundred forty".