1400243553 has 6 divisors (see below), whose sum is σ = 2022574034. Its totient is φ = 933495696.

The previous prime is 1400243543. The next prime is 1400243563. The reversal of 1400243553 is 3553420041.

It is an interprime number because it is at equal distance from previous prime (1400243543) and next prime (1400243563).

It can be written as a sum of positive squares in only one way, i.e., 1141291089 + 258952464 = 33783^2 + 16092^2 .

It is not a de Polignac number, because 1400243553 - 2⁹ = 1400243041 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1400243543) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 77791300 + ... + 77791317.

Almost surely, 2^1400243553 is an apocalyptic number.

It is an amenable number.

1400243553 is a deficient number, since it is larger than the sum of its proper divisors (622330481).

1400243553 is a wasteful number, since it uses less digits than its factorization.

1400243553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155582623 (or 155582620 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 27.

The square root of 1400243553 is about 37419.8283400659. The cubic root of 1400243553 is about 1118.7538097599.

Adding to 1400243553 its reverse (3553420041), we get a palindrome (4953663594).

The spelling of 1400243553 in words is "one billion, four hundred million, two hundred forty-three thousand, five hundred fifty-three".