29903989 has 2 divisors, whose sum is σ = 29903990. Its totient is φ = 29903988.

The previous prime is 29903983. The next prime is 29904011. The reversal of 29903989 is 98930992.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28836900 + 1067089 = 5370^2 + 1033^2 .

It is a cyclic number.

It is not a de Polignac number, because 29903989 - 2¹¹ = 29901941 is a prime.

It is a super-2 number, since 2×29903989² = 1788497116224242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (29903983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14951994 + 14951995.

It is an arithmetic number, because the mean of its divisors is an integer number (14951995).

Almost surely, 2^29903989 is an apocalyptic number.

It is an amenable number.

29903989 is a deficient number, since it is larger than the sum of its proper divisors (1).

29903989 is an equidigital number, since it uses as much as digits as its factorization.

29903989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 314928, while the sum is 49.

The square root of 29903989 is about 5468.4539862744. The cubic root of 29903989 is about 310.3914202390.

The spelling of 29903989 in words is "twenty-nine million, nine hundred three thousand, nine hundred eighty-nine".