1900220426 has 36 divisors (see below), whose sum is σ = 3137473458. Its totient is φ = 858046032.

The previous prime is 1900220347. The next prime is 1900220431. The reversal of 1900220426 is 6240220091.

It can be written as a sum of positive squares in only one way, i.e., 1827135025 + 73085401 = 42745^2 + 8549^2 .

It is a super-2 number, since 2×1900220426² = 7221675334775242952, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a junction number, because it is equal to n+sod(n) for n = 1900220395 and 1900220404.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 18448691 + ... + 18448793.

Almost surely, 2^1900220426 is an apocalyptic number.

1900220426 is a deficient number, since it is larger than the sum of its proper divisors (1237253032).

1900220426 is an equidigital number, since it uses as much as digits as its factorization.

1900220426 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 387 (or 201 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 1900220426 is about 43591.5178217047. The cubic root of 1900220426 is about 1238.6102245044.

Multiplying 1900220426 by its sum of digits (26), we get a square (49405731076 = 222274²).

1900220426 divided by its sum of digits (26) gives a square (73085401 = 8549²).

The spelling of 1900220426 in words is "one billion, nine hundred million, two hundred twenty thousand, four hundred twenty-six".