120391906 has 8 divisors (see below), whose sum is σ = 182275920. Its totient is φ = 59633268.

The previous prime is 120391903. The next prime is 120391933. The reversal of 120391906 is 609193021.

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

It is a super-2 number, since 2×120391906² = 28988422060625672, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (120391903) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 281076 + ... + 281503.

It is an arithmetic number, because the mean of its divisors is an integer number (22784490).

Almost surely, 2^120391906 is an apocalyptic number.

120391906 is a deficient number, since it is larger than the sum of its proper divisors (61884014).

120391906 is a wasteful number, since it uses less digits than its factorization.

120391906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 562688.

The product of its (nonzero) digits is 2916, while the sum is 31.

The square root of 120391906 is about 10972.3245486086. The cubic root of 120391906 is about 493.7787887716.

The spelling of 120391906 in words is "one hundred twenty million, three hundred ninety-one thousand, nine hundred six".