290421487 has 2 divisors, whose sum is σ = 290421488. Its totient is φ = 290421486.

The previous prime is 290421451. The next prime is 290421539. The reversal of 290421487 is 784124092.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 290421487 - 2¹⁵ = 290388719 is a prime.

It is a super-2 number, since 2×290421487² = 168689280222582338, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (290422487) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 145210743 + 145210744.

It is an arithmetic number, because the mean of its divisors is an integer number (145210744).

Almost surely, 2^290421487 is an apocalyptic number.

290421487 is a deficient number, since it is larger than the sum of its proper divisors (1).

290421487 is an equidigital number, since it uses as much as digits as its factorization.

290421487 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32256, while the sum is 37.

The square root of 290421487 is about 17041.7571570540. The cubic root of 290421487 is about 662.2311139518.

The spelling of 290421487 in words is "two hundred ninety million, four hundred twenty-one thousand, four hundred eighty-seven".