133988890 has 16 divisors (see below), whose sum is σ = 275634432. Its totient is φ = 45939024.

The previous prime is 133988887. The next prime is 133988909. The reversal of 133988890 is 98889331.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 956994 + ... + 957133.

It is an arithmetic number, because the mean of its divisors is an integer number (17227152).

Almost surely, 2^133988890 is an apocalyptic number.

133988890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

133988890 is an abundant number, since it is smaller than the sum of its proper divisors (141645542).

133988890 is a wasteful number, since it uses less digits than its factorization.

133988890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1914141.

The product of its (nonzero) digits is 373248, while the sum is 49.

The square root of 133988890 is about 11575.3570139327. The cubic root of 133988890 is about 511.7088519061.

The spelling of 133988890 in words is "one hundred thirty-three million, nine hundred eighty-eight thousand, eight hundred ninety".