1133621388 has 36 divisors (see below), whose sum is σ = 2926516320. Its totient is φ = 369833376.

The previous prime is 1133621351. The next prime is 1133621389. The reversal of 1133621388 is 8831263311.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (1133621389) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 333303 + ... + 336686.

It is an arithmetic number, because the mean of its divisors is an integer number (81292120).

Almost surely, 2^1133621388 is an apocalyptic number.

1133621388 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

1133621388 is an abundant number, since it is smaller than the sum of its proper divisors (1792894932).

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

1133621388 is a wasteful number, since it uses less digits than its factorization.

1133621388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 670046 (or 670041 counting only the distinct ones).

The product of its digits is 20736, while the sum is 36.

The square root of 1133621388 is about 33669.2944387019. The cubic root of 1133621388 is about 1042.6919253977.

Adding to 1133621388 its reverse (8831263311), we get a palindrome (9964884699).

It can be divided in two parts, 1133 and 621388, that added together give a square (622521 = 789²).

The spelling of 1133621388 in words is "one billion, one hundred thirty-three million, six hundred twenty-one thousand, three hundred eighty-eight".