101920389 has 32 divisors (see below), whose sum is σ = 153031680. Its totient is φ = 59956992.

The previous prime is 101920387. The next prime is 101920409. The reversal of 101920389 is 983029101.

It is not a de Polignac number, because 101920389 - 2¹ = 101920387 is a prime.

It is a super-2 number, since 2×101920389² = 20775531387822642, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (101920387) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 103192 + ... + 104174.

It is an arithmetic number, because the mean of its divisors is an integer number (4782240).

Almost surely, 2^101920389 is an apocalyptic number.

101920389 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

101920389 is a deficient number, since it is larger than the sum of its proper divisors (51111291).

101920389 is a wasteful number, since it uses less digits than its factorization.

101920389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1129.

The product of its (nonzero) digits is 3888, while the sum is 33.

The square root of 101920389 is about 10095.5628372072. The cubic root of 101920389 is about 467.1112827773. Note that the first 3 decimals are identical.

The spelling of 101920389 in words is "one hundred one million, nine hundred twenty thousand, three hundred eighty-nine".