1421556399 has 10 divisors (see below), whose sum is σ = 2123559680. Its totient is φ = 947704212.

The previous prime is 1421556379. The next prime is 1421556419. The reversal of 1421556399 is 9936551241.

1421556399 is a `hidden beast` number, since 1 + 4 + 2 + 1 + 5 + 5 + 639 + 9 = 666.

It is an interprime number because it is at equal distance from previous prime (1421556379) and next prime (1421556419).

It is not a de Polignac number, because 1421556399 - 2¹³ = 1421548207 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1421556319) 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 9 ways as a sum of consecutive naturals, for example, 8774959 + ... + 8775120.

It is an arithmetic number, because the mean of its divisors is an integer number (212355968).

Almost surely, 2^1421556399 is an apocalyptic number.

1421556399 is a deficient number, since it is larger than the sum of its proper divisors (702003281).

1421556399 is an equidigital number, since it uses as much as digits as its factorization.

1421556399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17550091 (or 17550082 counting only the distinct ones).

The product of its digits is 291600, while the sum is 45.

The square root of 1421556399 is about 37703.5329776932. The cubic root of 1421556399 is about 1124.4013668461.

The spelling of 1421556399 in words is "one billion, four hundred twenty-one million, five hundred fifty-six thousand, three hundred ninety-nine".