420834891990 has 32 divisors (see below), whose sum is σ = 1015841925216. Its totient is φ = 111573950720.

The previous prime is 420834891973. The next prime is 420834892013. The reversal of 420834891990 is 99198438024.

It is a self number, because there is not a number n which added to its sum of digits gives 420834891990.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 40537671 + ... + 40548050.

It is an arithmetic number, because the mean of its divisors is an integer number (31745060163).

Almost surely, 2^420834891990 is an apocalyptic number.

420834891990 is an abundant number, since it is smaller than the sum of its proper divisors (595007033226).

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

420834891990 is a wasteful number, since it uses less digits than its factorization.

420834891990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81085904.

The product of its (nonzero) digits is 4478976, while the sum is 57.

The spelling of 420834891990 in words is "four hundred twenty billion, eight hundred thirty-four million, eight hundred ninety-one thousand, nine hundred ninety".