421557090 has 16 divisors (see below), whose sum is σ = 1011737088. Its totient is φ = 112415216.

The previous prime is 421557077. The next prime is 421557107. The reversal of 421557090 is 90755124.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7025922 + ... + 7025981.

It is an arithmetic number, because the mean of its divisors is an integer number (63233568).

Almost surely, 2^421557090 is an apocalyptic number.

421557090 is an abundant number, since it is smaller than the sum of its proper divisors (590179998).

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

421557090 is a wasteful number, since it uses less digits than its factorization.

421557090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14051913.

The product of its (nonzero) digits is 12600, while the sum is 33.

The square root of 421557090 is about 20531.8554933547. The cubic root of 421557090 is about 749.8115615475.

The spelling of 421557090 in words is "four hundred twenty-one million, five hundred fifty-seven thousand, ninety".