1400256399 has 16 divisors (see below), whose sum is σ = 1949536512. Its totient is φ = 892296768.

The previous prime is 1400256349. The next prime is 1400256409. The reversal of 1400256399 is 9936520041.

It is a Cunningham number, because it is equal to 37420²-1.

It is not a de Polignac number, because 1400256399 - 2¹² = 1400252303 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1400256349) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 106027 + ... + 118499.

It is an arithmetic number, because the mean of its divisors is an integer number (121846032).

Almost surely, 2^1400256399 is an apocalyptic number.

1400256399 is a deficient number, since it is larger than the sum of its proper divisors (549280113).

1400256399 is a wasteful number, since it uses less digits than its factorization.

1400256399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14126.

The product of its (nonzero) digits is 58320, while the sum is 39.

The square root of 1400256399 is about 37419.9999866382. Note that the first 4 decimals coincide. The cubic root of 1400256399 is about 1118.7572309427.

The spelling of 1400256399 in words is "one billion, four hundred million, two hundred fifty-six thousand, three hundred ninety-nine".