1550400869 has 4 divisors (see below), whose sum is σ = 1550479680. Its totient is φ = 1550322060.

The previous prime is 1550400847. The next prime is 1550400877. The reversal of 1550400869 is 9680040551.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 1550400869 - 2¹² = 1550396773 is a prime.

It is a super-4 number, since 4×1550400869⁴ (a number of 38 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1550400809) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17402 + ... + 58340.

It is an arithmetic number, because the mean of its divisors is an integer number (387619920).

Almost surely, 2^1550400869 is an apocalyptic number.

It is an amenable number.

1550400869 is a deficient number, since it is larger than the sum of its proper divisors (78811).

1550400869 is an equidigital number, since it uses as much as digits as its factorization.

1550400869 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78810.

The product of its (nonzero) digits is 43200, while the sum is 38.

The square root of 1550400869 is about 39375.1300823248. The cubic root of 1550400869 is about 1157.3942871579.

The spelling of 1550400869 in words is "one billion, five hundred fifty million, four hundred thousand, eight hundred sixty-nine".