1900400039 has 4 divisors (see below), whose sum is σ = 1931554200. Its totient is φ = 1869245880.

The previous prime is 1900400027. The next prime is 1900400107. The reversal of 1900400039 is 9300040091.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 1900400039 - 2⁴ = 1900400023 is a prime.

It is a super-2 number, since 2×1900400039² = 7223040616462403042, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1900399990 and 1900400017.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1900400339) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15576989 + ... + 15577110.

It is an arithmetic number, because the mean of its divisors is an integer number (482888550).

Almost surely, 2^1900400039 is an apocalyptic number.

1900400039 is a deficient number, since it is larger than the sum of its proper divisors (31154161).

1900400039 is an equidigital number, since it uses as much as digits as its factorization.

1900400039 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31154160.

The product of its (nonzero) digits is 972, while the sum is 26.

The square root of 1900400039 is about 43593.5779559329. The cubic root of 1900400039 is about 1238.6492486594.

The spelling of 1900400039 in words is "one billion, nine hundred million, four hundred thousand, thirty-nine".