1840000402 has 4 divisors (see below), whose sum is σ = 2760000606. Its totient is φ = 920000200.

The previous prime is 1840000399. The next prime is 1840000411. The reversal of 1840000402 is 2040000481.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1002418921 + 837581481 = 31661^2 + 28941^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1840000402.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 460000099 + ... + 460000102.

Almost surely, 2^1840000402 is an apocalyptic number.

1840000402 is a deficient number, since it is larger than the sum of its proper divisors (920000204).

1840000402 is an equidigital number, since it uses as much as digits as its factorization.

1840000402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 920000203.

The product of its (nonzero) digits is 256, while the sum is 19.

The square root of 1840000402 is about 42895.2258648908. The cubic root of 1840000402 is about 1225.3852242857.

Adding to 1840000402 its reverse (2040000481), we get a palindrome (3880000883).

The spelling of 1840000402 in words is "one billion, eight hundred forty million, four hundred two", and thus it is an aban number.