1011204138 has 32 divisors (see below), whose sum is σ = 2312818560. Its totient is φ = 288728640.

The previous prime is 1011204109. The next prime is 1011204143. The reversal of 1011204138 is 8314021101.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 66208 + ... + 80036.

It is an arithmetic number, because the mean of its divisors is an integer number (72275580).

Almost surely, 2^1011204138 is an apocalyptic number.

1011204138 is an abundant number, since it is smaller than the sum of its proper divisors (1301614422).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1011204138 is a wasteful number, since it uses less digits than its factorization.

1011204138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15582.

The product of its (nonzero) digits is 192, while the sum is 21.

The square root of 1011204138 is about 31799.4361270762. The cubic root of 1011204138 is about 1003.7208507649.

Adding to 1011204138 its reverse (8314021101), we get a palindrome (9325225239).

The spelling of 1011204138 in words is "one billion, eleven million, two hundred four thousand, one hundred thirty-eight".