1863634542 has 96 divisors (see below), whose sum is σ = 4758735744. Its totient is φ = 481118400.

The previous prime is 1863634489. The next prime is 1863634543. The reversal of 1863634542 is 2454363681.

It is a super-2 number, since 2×1863634542² = 6946267412271099528, which contains 22 as substring.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a junction number, because it is equal to n+sod(n) for n = 1863634494 and 1863634503.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1863634543) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 557817 + ... + 561147.

It is an arithmetic number, because the mean of its divisors is an integer number (49570164).

Almost surely, 2^1863634542 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1863634542, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2379367872).

1863634542 is an abundant number, since it is smaller than the sum of its proper divisors (2895101202).

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

1863634542 is a wasteful number, since it uses less digits than its factorization.

1863634542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3534 (or 3527 counting only the distinct ones).

The product of its digits is 414720, while the sum is 42.

The square root of 1863634542 is about 43169.8337036408. The cubic root of 1863634542 is about 1230.6094633132.

The spelling of 1863634542 in words is "one billion, eight hundred sixty-three million, six hundred thirty-four thousand, five hundred forty-two".