1861421419 has 32 divisors (see below), whose sum is σ = 2263000320. Its totient is φ = 1508284800.

The previous prime is 1861421411. The next prime is 1861421423. The reversal of 1861421419 is 9141241681.

It is not a de Polignac number, because 1861421419 - 2³ = 1861421411 is a prime.

It is a super-2 number, since 2×1861421419² = 6929779398223947122, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a deceptive number, since it divides R_1861421418.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1861421411) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 734184 + ... + 736714.

It is an arithmetic number, because the mean of its divisors is an integer number (70718760).

Almost surely, 2^1861421419 is an apocalyptic number.

1861421419 is a deficient number, since it is larger than the sum of its proper divisors (401578901).

1861421419 is a wasteful number, since it uses less digits than its factorization.

1861421419 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2731.

The product of its digits is 13824, while the sum is 37.

The square root of 1861421419 is about 43144.1933404717. The cubic root of 1861421419 is about 1230.1221415711.

The spelling of 1861421419 in words is "one billion, eight hundred sixty-one million, four hundred twenty-one thousand, four hundred nineteen".