738989981 has 2 divisors, whose sum is σ = 738989982. Its totient is φ = 738989980.

The previous prime is 738989963. The next prime is 738990019. The reversal of 738989981 is 189989837.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 732784900 + 6205081 = 27070^2 + 2491^2 .

It is a cyclic number.

It is not a de Polignac number, because 738989981 - 2¹⁴ = 738973597 is a prime.

It is a super-2 number, since 2×738989981² = 1092212384036760722, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (738989921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 369494990 + 369494991.

It is an arithmetic number, because the mean of its divisors is an integer number (369494991).

Almost surely, 2^738989981 is an apocalyptic number.

It is an amenable number.

738989981 is a deficient number, since it is larger than the sum of its proper divisors (1).

738989981 is an equidigital number, since it uses as much as digits as its factorization.

738989981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7838208, while the sum is 62.

The square root of 738989981 is about 27184.3701600754. The cubic root of 738989981 is about 904.0924658890.

The spelling of 738989981 in words is "seven hundred thirty-eight million, nine hundred eighty-nine thousand, nine hundred eighty-one".