1400445405 has 48 divisors (see below), whose sum is σ = 2493809136. Its totient is φ = 726589440.

The previous prime is 1400445391. The next prime is 1400445437. The reversal of 1400445405 is 5045440041.

It can be written as a sum of positive squares in 8 ways, for example, as 836192889 + 564252516 = 28917^2 + 23754^2 .

It is not a de Polignac number, because 1400445405 - 2¹² = 1400441309 is a prime.

It is a super-2 number, since 2×1400445405² = 3922494664771228050, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 798009 + ... + 799761.

It is an arithmetic number, because the mean of its divisors is an integer number (51954357).

Almost surely, 2^1400445405 is an apocalyptic number.

1400445405 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1400445405 is a deficient number, since it is larger than the sum of its proper divisors (1093363731).

1400445405 is a wasteful number, since it uses less digits than its factorization.

1400445405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2238 (or 2235 counting only the distinct ones).

The product of its (nonzero) digits is 6400, while the sum is 27.

The square root of 1400445405 is about 37422.5253690875. The cubic root of 1400445405 is about 1118.8075651330.

Adding to 1400445405 its reverse (5045440041), we get a palindrome (6445885446).

The spelling of 1400445405 in words is "one billion, four hundred million, four hundred forty-five thousand, four hundred five".