1199426557 has 6 divisors (see below), whose sum is σ = 1395251358. Its totient is φ = 1028079864.

The previous prime is 1199426513. The next prime is 1199426561. The reversal of 1199426557 is 7556249911.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 1194808356 + 4618201 = 34566^2 + 2149^2 .

It is not a de Polignac number, because 1199426557 - 2¹⁹ = 1198902269 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (49), and also a Moran number because the ratio is a prime number: 24478093 = 1199426557 / (1 + 1 + 9 + 9 + 4 + 2 + 6 + 5 + 5 + 7).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1199426557.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1199426257) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12238998 + ... + 12239095.

It is an arithmetic number, because the mean of its divisors is an integer number (232541893).

Almost surely, 2^1199426557 is an apocalyptic number.

It is an amenable number.

1199426557 is a deficient number, since it is larger than the sum of its proper divisors (195824801).

1199426557 is an equidigital number, since it uses as much as digits as its factorization.

1199426557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24478107 (or 24478100 counting only the distinct ones).

The product of its digits is 680400, while the sum is 49.

The square root of 1199426557 is about 34632.7382255576. The cubic root of 1199426557 is about 1062.4892716241.

The spelling of 1199426557 in words is "one billion, one hundred ninety-nine million, four hundred twenty-six thousand, five hundred fifty-seven".