290121642 has 32 divisors (see below), whose sum is σ = 648298560. Its totient is φ = 96169680.

The previous prime is 290121641. The next prime is 290121649. The reversal of 290121642 is 246121092.

290121642 is a `hidden beast` number, since 2 + 9 + 0 + 12 + 1 + 642 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (290121641) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5068 + ... + 24615.

It is an arithmetic number, because the mean of its divisors is an integer number (20259330).

Almost surely, 2^290121642 is an apocalyptic number.

290121642 is an abundant number, since it is smaller than the sum of its proper divisors (358176918).

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

290121642 is a wasteful number, since it uses less digits than its factorization.

290121642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29875 (or 29869 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 290121642 is about 17032.9575235776. The cubic root of 290121642 is about 662.0031291400.

The spelling of 290121642 in words is "two hundred ninety million, one hundred twenty-one thousand, six hundred forty-two".