1400445391 has 2 divisors, whose sum is σ = 1400445392. Its totient is φ = 1400445390.

The previous prime is 1400445379. The next prime is 1400445437. The reversal of 1400445391 is 1935440041.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1400445391 - 2¹⁵ = 1400412623 is a prime.

It is a super-2 number, since 2×1400445391² = 3922494586346285762, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1400445791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 700222695 + 700222696.

It is an arithmetic number, because the mean of its divisors is an integer number (700222696).

Almost surely, 2^1400445391 is an apocalyptic number.

1400445391 is a deficient number, since it is larger than the sum of its proper divisors (1).

1400445391 is an equidigital number, since it uses as much as digits as its factorization.

1400445391 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 1400445391 is about 37422.5251820344. The cubic root of 1400445391 is about 1118.8075614048.

It can be divided in two parts, 14004 and 45391, that added together give a palindrome (59395).

The spelling of 1400445391 in words is "one billion, four hundred million, four hundred forty-five thousand, three hundred ninety-one".