190426921 has 2 divisors, whose sum is σ = 190426922. Its totient is φ = 190426920.

The previous prime is 190426903. The next prime is 190426961. The reversal of 190426921 is 129624091.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 115863696 + 74563225 = 10764^2 + 8635^2 .

It is a cyclic number.

It is not a de Polignac number, because 190426921 - 2⁵ = 190426889 is a prime.

It is not a weakly prime, because it can be changed into another prime (190426961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95213460 + 95213461.

It is an arithmetic number, because the mean of its divisors is an integer number (95213461).

Almost surely, 2^190426921 is an apocalyptic number.

It is an amenable number.

190426921 is a deficient number, since it is larger than the sum of its proper divisors (1).

190426921 is an equidigital number, since it uses as much as digits as its factorization.

190426921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7776, while the sum is 34.

The square root of 190426921 is about 13799.5261150519. The cubic root of 190426921 is about 575.3199691104.

The spelling of 190426921 in words is "one hundred ninety million, four hundred twenty-six thousand, nine hundred twenty-one".