1138479901 has 8 divisors (see below), whose sum is σ = 1239832440. Its totient is φ = 1039095552.

The previous prime is 1138479887. The next prime is 1138479949. The reversal of 1138479901 is 1099748311.

It can be written as a sum of positive squares in 4 ways, for example, as 2722500 + 1135757401 = 1650^2 + 33701^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1138479901 - 2⁵ = 1138479869 is a prime.

It is a super-2 number, since 2×1138479901² = 2592272969961939602, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1138479971) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 490840 + ... + 493153.

It is an arithmetic number, because the mean of its divisors is an integer number (154979055).

Almost surely, 2^1138479901 is an apocalyptic number.

It is an amenable number.

1138479901 is a deficient number, since it is larger than the sum of its proper divisors (101352539).

1138479901 is an equidigital number, since it uses as much as digits as its factorization.

1138479901 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 984095.

The product of its (nonzero) digits is 54432, while the sum is 43.

The square root of 1138479901 is about 33741.3677997795. The cubic root of 1138479901 is about 1044.1794038636.

The spelling of 1138479901 in words is "one billion, one hundred thirty-eight million, four hundred seventy-nine thousand, nine hundred one".