1902438949 has 2 divisors, whose sum is σ = 1902438950. Its totient is φ = 1902438948.

The previous prime is 1902438931. The next prime is 1902438971. The reversal of 1902438949 is 9498342091.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1450238724 + 452200225 = 38082^2 + 21265^2 .

It is a cyclic number.

It is not a de Polignac number, because 1902438949 - 2¹³ = 1902430757 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1902438919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 951219474 + 951219475.

It is an arithmetic number, because the mean of its divisors is an integer number (951219475).

Almost surely, 2^1902438949 is an apocalyptic number.

It is an amenable number.

1902438949 is a deficient number, since it is larger than the sum of its proper divisors (1).

1902438949 is an equidigital number, since it uses as much as digits as its factorization.

1902438949 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 559872, while the sum is 49.

The square root of 1902438949 is about 43616.9571267873. The cubic root of 1902438949 is about 1239.0920662482.

The spelling of 1902438949 in words is "one billion, nine hundred two million, four hundred thirty-eight thousand, nine hundred forty-nine".