1401400655 has 4 divisors (see below), whose sum is σ = 1681680792. Its totient is φ = 1121120520.

The previous prime is 1401400643. The next prime is 1401400681. The reversal of 1401400655 is 5560041041.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5560041041 = 19 ⋅292633739.

It is not a de Polignac number, because 1401400655 - 2¹² = 1401396559 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 140140061 + ... + 140140070.

It is an arithmetic number, because the mean of its divisors is an integer number (420420198).

Almost surely, 2^1401400655 is an apocalyptic number.

1401400655 is a deficient number, since it is larger than the sum of its proper divisors (280280137).

1401400655 is an equidigital number, since it uses as much as digits as its factorization.

1401400655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 280280136.

The product of its (nonzero) digits is 2400, while the sum is 26.

The square root of 1401400655 is about 37435.2862283702. The cubic root of 1401400655 is about 1119.0618885116.

Adding to 1401400655 its reverse (5560041041), we get a palindrome (6961441696).

The spelling of 1401400655 in words is "one billion, four hundred one million, four hundred thousand, six hundred fifty-five".