1400436431389 has 2 divisors, whose sum is σ = 1400436431390. Its totient is φ = 1400436431388.

The previous prime is 1400436431357. The next prime is 1400436431447. The reversal of 1400436431389 is 9831346340041.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1087675868889 + 312760562500 = 1042917^2 + 559250^2 .

It is a cyclic number.

It is not a de Polignac number, because 1400436431389 - 2⁵ = 1400436431357 is a prime.

It is a super-2 number, since 2×1400436431389² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1400436431189) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 700218215694 + 700218215695.

It is an arithmetic number, because the mean of its divisors is an integer number (700218215695).

Almost surely, 2^{1400436431389} is an apocalyptic number.

It is an amenable number.

1400436431389 is a deficient number, since it is larger than the sum of its proper divisors (1).

1400436431389 is an equidigital number, since it uses as much as digits as its factorization.

1400436431389 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 746496, while the sum is 46.

The spelling of 1400436431389 in words is "one trillion, four hundred billion, four hundred thirty-six million, four hundred thirty-one thousand, three hundred eighty-nine".